GE AB09SC2VHA Page 64 Service Manual Download

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LARGE CASSETTE TECHNICAL OVERVIEW

ENGLISH

E-8

Testing

Test Condensate Pump and Float Switch

If the internal condensate pump does not operate, the pump may be bad or the float switch may be defective. Perform the

following test:
1. Access the electrical control box.
2.

Unplug the float switch from the circuit board.

3. The pump should start.
4. If the pump does not start, check for voltage at the pump connector on the board. There should be 230 Volts AC to the pump.

If there is not, the circuit board is defective. If there is proper voltage to the pump, either the pump or associated pump wiring
is defective.

Summary of Contents for AB09SC2VHA

Page 1: ...e I 1 Outdoor ASH220NCDWA ASH324NCDWA ASH436NCDWA Indoor Wall Mount Highwall ASYW07URDWA ASYW09URDWA ASYW12URDWA ASYW18URDWA 2 x2 Compact Cassette AB09SC2VHA AB12SC2VHA AB18SC2VHA 3 x3 Large Cassette AL24LP2VHA Slim Duct AD07SL2VHB AD09SL2VHB AD12SL2VHB AD18SL2VHB Mid Static Ducted USYM09UCDSA USYM12UCDSA USYM18UCDSA USYM24UCDSA Console USYF09UCDWA USYF12UCDWA USYF18UCDWA Before troubleshooting or...

Page 2: ...Oct 2020 Manual release Revision History ...

Page 3: ...ode A 6 Heat Mode A 7 Indoor Fan Control A 7 Cold Air Proof Operation A 7 Timing A 7 Indoor System Mode Conflict A 7 Abnormality Confirmation Approaches A 8 Low Load Protection Control A 8 High Load Protection Control A 8 When the Compressor First Starts A 8 The Outdoor Fan Control Exchange Fan A 8 The Outdoor Fan Control When In Cooling or Dehumidifying Mode A 8 The Control of the Outdoor Unit Ex...

Page 4: ...ical connections between the indoor and outdoor units Firmly clamp the interconnecting wires so they receive no external stresses Incomplete connections or clamping may cause terminal over heating or fire After completing interconnecting and supply wiring connections shape the cables so that they do not put undue force on the electrical covers or panels Install covers over the wires Incomplete cov...

Page 5: ...19000 20000 35 000 Max HeatingCapacity 15 FBtu hr 15000 16000 25 200 PowerSupply Voltage Cycle PhaseV Hz 208 230 60 1 208 230 60 1 208 230 60 1 WireSizebetweenIDandOD 14 4AWGStranded 14 4AWGStranded 14 4AWGStranded CompressorType DCInverterDrivenRotary DCInverterDrivenRotary DCInverterDrivenRotary MaximumFuseSizeA 25 25 40 MinimumCircuitAmpA 15 16 30 OutdoorUnit OutdoorFanSpeedRPM 300 900 300 900 ...

Page 6: ... AD07SL2VH AD09SL2VH AD12SL2VH AD18SL2VH Rated Cooling Capacity Btu hr 7 000 9 000 12 000 18 000 Rated Heating Capacity Btu hr 8 000 10 000 13 000 19 000 Voltage Cycle Phase V Hz 208 230 60 1 208 230 60 1 208 230 60 1 208 230 60 1 Airflow CFM Turbo H M L Quiet 353 312 270 230 188 353 312 270 230 188 400 353 282 247 218 540 500 447 365 306 Max Ext Static Pressure in W G Pa 0 16 40 0 16 40 0 16 40 0...

Page 7: ...dCoolingCapacityBtu hr 9 000 12 000 15 000 RatedHeatingCapacityBtu hr 10 000 13 000 18 000 Voltage Cycle PhaseV Hz 208 230 60 1 208 230 60 1 208 230 60 1 Airflow Turbo High Med Low Quiet CFM 264 235 205 176 147 294 264 205 176 147 341 311 282 252 223 IndoorSoundLeveldB Turbo High Med Low Quiet 40 32 25 20 42 34 26 21 46 37 33 28 ChassisDimension HxWxDin mm 23 6 27 5 8 3 600 700 210 Weight Ship Net...

Page 8: ...the compressor will be stopped and the malfunction will be recorded in the malfunction list The indoor system will continue to run When the temperature of the indoor coil is raised to 45 F the compressor will be restarted again the requirement of 3 minutes delay should be satisfied Dry Mode Dehumidifying Mode Temperature control range 60 86 F Temperature difference 2 F Control feature Send the deh...

Page 9: ...efrosting finishes the coil malfunction will still be neglected until the compressor has been started up for 30 seconds The indoor temperature display will not change and the system operates at the cold air proof mode Automatic heating temperature compensation when the system enters the heating mode the temperature compensation 4 will be added When the status is switched off the compensation will ...

Page 10: ...ed when the coil temperature is below 108 F and the system has been stopped for 3 minutes The malfunction will be stored in the malfunction resume and will not be revealed When the Compressor First Starts The compressor will start in low frequency After a brief time delay the compressor will come up to operating speed to meet the demand requirement for capacity The Outdoor Fan Control Exchange Fan...

Page 11: ... sensor reads temperatures in excess of 131F Conditions that cause high indoor coil temperature include indoor fan failure dirty indoor coil and operating the system in heat mode when outdoor air temperatures exceed operating limit Too warm outside Should this routine be initiated the system will reduce compressor frequency until the indoor coil temperature reaches 117F Once this is achieved the s...

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Page 13: ... Compressor Sump Heater B 11 Defrost Control B 12 Base Pan Heater Control Logic B 12 Troubleshooting the Base Pan Heater Error B 12 Discharge Sensor Protection B 12 High Current Protection B 13 High Pressure Protection in Cooling B 13 High Pressure Protection In Heating B 13 Low Pressure Protection B 14 Oil Return Cycle B 15 Testing B 16 Outdoor Fan Motor B 16 Temperature Sensor B 16 4 Way Valve B...

Page 14: ...ill maintain individualized room temperatures as set on each controller provided all units are in the same mode If the first unit to be turned on is set to the heating mode all units will heat If the first unit to be turned on is set to the cooling mode all units will cool 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 4 Way Valve Accumulator Compressor Defrost Temperature Sensor Discharge Temperature Sensor...

Page 15: ...eration that could cause damage to the compressor windings IPM generates a large amount of heat during operation This heat is transfered to a heat sink behind the board then mixed with the outdoor air The Tm temperature sensor protects the IPM from excessive temperatures 2 1 3 Service Monitor Board SMB Inverter Power Module IPM 2U 3U 2 3 4 1 1 4U The Inverter Power Module generates 3 phase variabl...

Page 16: ...t monitor the temperature of the refrigerant entering and leaving each circuit These sensors are mounted in a group near the center of the circuit board There are system temperature sensors that monitor refrigerant line temperature and outdoor air temperatures These sensors plug into the PCB via Plugs CN 14 CN 1 CN 7 and CN 24 The system has two refrigerant pressure switches a Low Pressure Switch ...

Page 17: ...apacitors are fully charged the circuit opens to stop the charging process via the RL 2 relay The voltage between the two pins of CN 1 and the two pins of CN 2 is 12 VDC 2 2 6 4 4 3 3 5 1 1 The purpose of the PFB is to filter out potential electrical noise before it reaches the outdoor unit electronic circuits All voltage to operate the outdoor unit circuits must pass through the PFB 1 2 6 4 5 3 P...

Page 18: ...e compressor will discharge hot gas into the oil separator Oil will be trapped in the separator and returned to the suction inlet of the compressor via the capillary tube assembly low pressure path Comp ressor Discharge temp sensor Oil separator Capillary tube Ø2 7 Ø1 0 1400 High pressure switch 4 way valve Pipe sensor Toci Suction temp sensor Ts Low pressure switch Accumulator Gas service valve O...

Page 19: ...mperature of the refrigerant leaving the EEV The low pressure low temperature refrigerant will enter the mixed phase liquid line and travel to the indoor unit Heat from the indoor air passing across the evaporator coil will transfer to the cold refrigerant sending cool air into the space and changing the liquid refrigerant into a cool vapor The cold vapor will travel down the vapor line and return...

Page 20: ...nit will send the room temperature and set point requirement to the outdoor unit PCB via the data signal wire path The data travels from the indoor unit to the outdoor unit via the wire located on terminal 3 C The indoor unit louvers will open The fan will not start until the coil has warmed sufficiently to avoid cold drafts EEVs serving indoor circuits will step to the standard opening The outdoo...

Page 21: ...uid returning from the indoor coil The indoor EEV opening angle is fixed The liquid will enter the Liquid Line Strainer and will pass through the OPEN EEV The refrigerant liquid now enters a receiver where excess refrigerant will store After the liquid leaves the Liquid Receiver it will enter the restriction of the OUTDOOR UNIT s EEV which changes the liquid refrigerant to a lower pressure and tem...

Page 22: ...rosting FQY 80 Hz E 60s Soft startup Compressor 0HZ 0HZ 5s Outdoor motor ON Send defrosting signal to indoor Auto OFF 4 way valve ON OFF 15s 450 pulse 450 pulse 350 pulse E All EEVs Auto open angle Auto open angle All indoor motors ON OFF Anti cold air fun ction Multi Defrost Cycle Sequence of Operation ...

Page 23: ...huts off a 3 minute delay will occur before the 4 way valve is powered down and switches back to the at rest cooling position If the 4 way valve does not switch into the heating mode after 15 minutes of compressor run time and the indoor coil temperature is below 41 F 5 C the compressor will stop and the unit will display a 17 flash error code on the outdoor PCB Compressor Sump Heater The sump cra...

Page 24: ... above 44 F 7 C for 60 seconds or is above 54 F 12 C for 30 seconds the defrost cycle will terminate If these temperatures cannot be reached the defrost cycle will automatically terminate in 10 minutes Timed Defrost Option When the outdoor ambient temperature sensor detects Ta is less than 32 F 0 C In heating mode compressor runs continuously for 60 minutes or for 240 minutes in all When the above...

Page 25: ... 5A 10A ASH324NCDWA 13 5 14A ASH436NCDWA High Pressure Protection in Cooling If there is an abnormal stop 3 times in 1 hour the unit will turn off Turn off and restore power to clear error Reduce FQY rapidly 2Hz S Reduce FQY slowly 1Hz S Remain FQY Raise FQY slowly 1Hz 10S 131O F 55O C Tc cooling 138O F 59O C 144O F 62O C 147O F 64O C 150O F 66O C Remain FQY If the temperature reaches 158O F 70O C...

Page 26: ...tions The first 8 minutes of run time when the compressor starts a new cycle During defrost When the ambient temperature is below 32 F 0 C Following the termination of an oil return cycle When any of the above 4 conditions are present low pressure protection is provided by the coil temperature sensors in both heating Te and cooling Tc2 modes Operate normally Min running FQY 20Hz LP OFF FQY 20Hz LP...

Page 27: ... Tc2AVE Max 10 minutes Oil Return in Heating Mode Oil Return Exit Conditions Heating Max 9 minutes E OR OR Td Tc for 30s continuously 5 minutes later begin to count Ts Tc2AVE for 30s continuously 5 minutes later begin to count Running for min 5 minutes Send oil return signal oil return begins oil return over Inverter compressor indicated FQCY 60s oil return FQCY 60s soft startup 0HZ 0HZ 5s Outdoor...

Page 28: ...ate This is the feedback voltage to the PCB for determining the speed of the fan motor If the outdoor fan initially runs increases speed then stops and the Service Monitor Board indicates an error code of 09 the feedback circuit is not functioning Check that the wiring and plug connections are in good condition Outdoor Fan 310VDC Pins 1 3 Outdoor Fan 15VDC Pins 3 4 Outdoor Fan Control Pins 3 5 Out...

Page 29: ...enoid coil will have to be replaced 5 If the coil resistance is within the tolerance use a magnet along the valve body to determine the location of the piston If one end of the piston is against the end of the valve body it is stuck and the valve must be replaced 6 Partial shifting of the valve can be detected by measuring the temperature of the suction gas where it enters the reversing valve and ...

Page 30: ... Repeat process outlined in step 5 Repair or replace the wires if the compressor windings check properly 8 Check each terminal to ground suction line connection at compressor to check for grounded windings if the resistance values are not correct 9 Replace the compressor if the winding measurements are greater than 7 out of specification Wiring Error Check 1 Disconnect power to the outdoor unit 2 ...

Page 31: ...re Sensor Ts Compressor Suction Temp Sensor Ta Ambient Temp Sensor Td Compressor Discharge Temp Sensor Te Defrosting Temp Sensor Tm Module Temp Sensor Tc1 a b c d e Condensing Temp Sensor for Indoor Units a b c d e Gas Pipe Tc2 a b c d e Condensing Temp Sensor for Indoor Units a b c d e Liquid Pipe R P2 N F30A 250VAC FUSE P1 L RL1 P7 P6 P5 P4 P3 W B ON 4 3 2 1 CN2 CN3 CN1 CN4 SW1 4 3 2 1 5 1 2 3 4...

Page 32: ...ature Sensor Ts Compressor Suction Temp Sensor Ta Ambient Temp Sensor Td Compressor Discharge Temp Sensor Te Defrosting Temp Sensor Tm Module Temp Sensor Tc1 a b c d e Condensing Temp Sensor for Indoor Units a b c d e Gas Pipe Tc2 a b c d e Condensing Temp Sensor for Indoor Units a b c d e Liquid Pipe R R P2 N POWER FILTER BOARD F30A 250VAC FUSE P1 L RL1 P7 P6 P5 P4 P3 W B ON 4 3 2 1 CN2 CN3 CN1 C...

Page 33: ...etting without technical support 4 The LED1 LED5 in the service display board in turn corresponds to the communication status of ndoor unitA B C D LED will not lit if communication abnormal SW1 SW2 SW3 SW4 Start Stop FA Y G R EARTH L1 L2 L1 Gas Pipe TC2 Condensing Temp for Indoor Units A B C D Liquid Pipe Definition of Dispaly board SW1 SW1 1 SW1 2SW1 3SW1 4 Normal Operating default OFF OFF OFF OF...

Page 34: ... operation valid OFF Quiet operation invalid ON Note 1 Power input restrict selection OFF invalid ON valid 3500W 2 Quiet operation If OFF the outdoor unit will calculate and obtain the average ambient temperature of the unit within the last 24 hours Tao_average_24 Then compare the current ambient temperature with the ambient temperature average Tao_average_24 and combine it with the previous ambie...

Page 35: ...d heating ON OFF OFF OFF Forced cooling OFF ON OFF OFF Rated operation OFF OFF ON OFF Time defrost valid Defrost initiates if needed when the compressor has been on for 10 minutes continuously and 50 minutes cumulative Termination conditions are the same as demand defrost OFF OFF OFF ON Wiring check active ON ON ON ON Description SW7 1 SW7 2 SW7 3 SW7 4 SW7 5 SW7 6 SW7 7 SW7 8 USA energy efficienc...

Page 36: ...e sensor failure Circuit B 34 Gas pipe sensor failure Circuit C 35 Gas pipe sensor failure Circuit D 36 Gas pipe sensor failure Circuit E 38 Malfunction of module temperature sensor momentary power failure detection 39 Malfunction of condensing temperature sensor 40 Liquid pipe sensor failure Circuit E 41 Toci temperature sensor failure 42 High Pressure switch open 43 Low Pressure switch open 44 S...

Page 37: ...door Wall Mount Unit Circuit Board C 3 Testing C 5 Accessing Components Removing Cover C 5 Indoor Fan Motor Voltage Check C 6 Replacing the Blower Motor C 6 Testing Temperature Sensors C 8 Testing Louver Motors C 8 Testing Communication Circuit C 8 Wiring Diagram C 9 Error Codes C 10 ASYW07URDWA ASYW09URDWA ASYW12URDWA ASYW18URDWA ...

Page 38: ...hould the feedback signal not be present during a call for indoor blower the indoor control board will indicate a Malfunction Code E14 Louver Stepper Motors Separate motors located in the indoor unit control the operation of the motorized louvers All of the louver motors are controlled via commands received from the remote control The blower motor is controlled by both the remote control and by co...

Page 39: ...ing functions of the indoor unit All control decisions are made by the outdoor unit ECU The indoor board has some limited diagnostic capability which will be covered in this manual Evaporator Coil Indoor Wall Mount Unit Circuit Board 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 10 11 9 The Indoor Unit Circuit Board communicates with the outdoor unit ECU via a connection at Terminal Block screw 3 The da...

Page 40: ...is open The indoor unit temperature sensors are connected to the control board When testing the calibration of these sensors the wires can be released from the plug by pressing on the tension tab on the side of the plug The receiver display unit that is mounted to the front cover of the indoor unit plugs into the control board There are two to three motors connected to the control board that contr...

Page 41: ...ad screws located near the bottom of the indoor unit These screws are located directly below the bottom of the air filter 4 Remove the filters 5 Manually open the louver 7 Remove the three screws located behind the caps 8 Remove the two screws that hold the digital display to the front cover The display can hang free 9 Release the air temperature sensor from the clip that holds it 10 Pull upward o...

Page 42: ...he indoor board is bad If voltage is present continue on 2 Check the voltage between Pins 3 and 4 The voltage should be 15VDC If it is not present the board is bad If voltage is present continue on 3 Check for voltage between Pins 3 and 6 If no DC voltage is present the board is bad If voltage is present change the motor 3 Remove the cover from the electrical box on the right side of the indoor un...

Page 43: ...orator coil and remove the motor bracket 8 Loosen the motor shaft set screw Phillips head screw 9 Unplug the motor from the circuit board 10 Lift and slide the motor away from the blower wheel 11 Remove the two black anti vibration mounts from the defective motor and place them on the new motor 12 Install new motor in reverse order ...

Page 44: ...board is bad or the louver motor is defective It is more likely the motor is defective than the board Make sure the louver assembly is not binding and keeping the vanes from moving 1 Remove power from the unit and remove the indoor unit cover 2 Access the circuit board Testing Communication Circuit If an Error E7 occurs perform the following test to determine if the indoor control board is functio...

Page 45: ...WALL MOUNT TECHNICAL OVERVIEW ENGLISH Topic Title C 9 Wiring Diagrams ...

Page 46: ...Indoor anti frosting protection F5 23 Module thermal overload F2 24 Compressor start failure over current F23 25 Phase current protection IPM F9 26 MCU reset F24 27 Module current detect circuit malfunction F10 28 Liquid pipe sensor failure Circuit A F16 29 Liquid pipe sensor failure Circuit B F17 30 Liquid pipe sensor failure Circuit C F18 31 Liquid pipe sensor failure Circuit D F29 32 Gas pipe s...

Page 47: ...sting D 5 Accessing the Blower Motor and Condensate Pump D 5 Removing Fan Motor D 5 Removing Condensate Pump D 5 Indoor Fan Motor Test Procedure D 6 Testing Temperature Sensors D 6 Testing Louver Motors D 7 Testing Communication Circuit D 7 Test Condensate Pump and Associated Float Switch D 8 Wiring Diagram DIP Switch Settings D 9 Error Codes D 10 AB09SC2VHA AB12SC2VHA AB18SC2VHA ...

Page 48: ... These wires should always be 14 gauge AWG Stranded type wire Splices in wires 1 or 3 may cause communication errors Motor Blower The indoor unit features a multi speed blower motor that will change speed to match the capacity demand from the outdoor unit Separate motors located in the indoor unit control the operation of the motorized louvers All of the louver motors are controlled via commands r...

Page 49: ... motors are controlled by pulsed voltage that cannot be measured If the louver does not move when it should check for a bind in the louvers Piping Temperature Sensor The Piping Temperature Sensor senses indoor coil temperature in the cooling mode and in the heating mode This sensor is used for Anti Freezing and Anti Cold Blow cycles The sensor also provides critical temperature information to the ...

Page 50: ...ard the Display Power Indicator will be lit The control board has a replaceable 3 15A 250V fuse that protects against excessive current If power is present at the board but the board does not work check for continuity through the fuse Replace if the fuse is open The indoor unit temperature sensors are connected at Plug CN 13 When testing the calibration of these sensors the wires can be released f...

Page 51: ... condensate pump 3 Remove assembly 8 Slide condensate pan from cassette 2 Fan blade will slide off motor shaft 3 Remove Phillips head screw holding cover plate over motor wiring leads 4 Remove 3 nuts that hold fan motor in place 5 Fan motor will come loose 3 Disconnect the main power wire to the indoor unit 4 Unplug the condensate pump and float switch from wiring harness 5 Unplug fan motor from w...

Page 52: ...ollowing 1 Confirm the sensor is firmly attached to the circuit board connection plug 2 Remove the sensor wires form the connection plug by releasing holding tension on the plugs tension tab 3 Use an ohmmeter to test the electrical resistance of the sensor 4 Measure the air temperature near the sensor and compare the required resistance against measured resistance See chart in reference section If...

Page 53: ...ing 1 Remove power from the unit and remove the indoor unit cover 2 Access the circuit board 3 Identify the inoperable louver motor on the schematic drawing below and disconnect the plug from the circuit board 4 Use an Ohmmeter to test the electrical continuity of the louver motor windings The proper resistance for each winding can be found in this table If the motor winding resistance is erratic ...

Page 54: ...tive Perform the following test 1 Access the electrical control box 2 Unplug the float switch from the circuit board 3 The pump should start 4 If the pump does not start check for voltage at the pump connector on the board There should be 230 Volts AC to the pump If there is not the circuit board is defective If there is proper voltage to the pump either the pump or associated pump wiring is defec...

Page 55: ...11 29 BM1 1 BM1 7 BM1 8 TYPE DEFINE OFF OFF BM1 2 BM1 3 BTU B BLACK R RED W WHITE Y G YELLOW GREEN TEMP SENSOR ROOM SENSOR FLOAT SWITCH HEATER PUMP UP DOWN CN9 CN1 CN6 PANNEL CN4 CN11 CN19 CN13 CN3 ON CN35 CN21 T5A 250VAC FUSE BM3 2 1 3 B W R Y G OFF OFF OFF ON OFF OFF OFF ON OFF ON ON OFF OFF OFF ON ON OFF ON OFF ON ON ON ON ON 9000 12000 18000 24000 28000 36000 48000 60000 NOTE1 DASHED PART ARE ...

Page 56: ...ed 4 2 Indoor anti frosting protection 4 3 23 Module thermal overload 4 4 24 Compressor start failure over current 4 5 25 Phase current protection IPM 4 6 26 MCU reset 4 7 27 Module current detect circuit malfunction 4 8 28 Liquid pipe sensor failure Circuit A 4 9 29 Liquid pipe sensor failure Circuit B 5 0 30 Liquid pipe sensor failure Circuit C 5 1 31 Liquid pipe sensor failure Circuit D 5 2 32 ...

Page 57: ...Board E 4 Testing E 5 Accessing the Blower Motor and Condensate Pump E 5 Removing Fan Motor E 5 Removing Condensate Pump E 5 Indoor Fan Motor Test Procedure E 6 Testing Temperature Sensors E 6 Testing Louver Motors E 7 Testing Communication Circuit E 7 Test Condensate Pump and Float Switch E 8 Wiring Diagram E 9 DIP Switch Settings E 10 Error Codes E 11 AL24LP2VHA ...

Page 58: ...s 1 and 3 complete the data path These wires should always be 14 gauge AWG Stranded type wire Splices in wires 1 or 3 may cause communication errors Motor Blower The indoor unit features a multi speed blower motor that will change speed to match the capacity demand from the outdoor unit Separate motors located in the indoor unit control the operation of the motorized louvers All of the louver moto...

Page 59: ... are controlled by pulsed voltage that cannot be measured If the louver does not move when it should check for a bind in the louvers Piping Temperature Sensor The Piping Temperature Sensor senses indoor coil temperature in the cooling mode and in the heating mode This sensor is used for Anti Freezing and Anti Cold Blow cycles The sensor also provides critical temperature information to the ECU tha...

Page 60: ...Line voltage to power the indoor unit comes in on Terminal Block connections 1 and 2 Power connects from these terminal connections to CH 3 and CH 4 on the circuit board If the board does not respond to commands and has no display check for line voltage at these connections When power is present at the indoor board the Display Power Indicator will be lit The control board has a replaceable 3 15A 2...

Page 61: ...ondensate water from the pan by removing drain plug 10 Remove the screws holding on the condensate pan 2 Fan blade will slide off motor shaft 3 Remove Phillips head screw holding cover plate over motor wiring leads 4 Remove 3 nuts that hold fan motor in place 5 Fan motor will come loose 3 Disconnect the main power wire to the indoor unit 4 Unplug the condensate pump and float switch from wiring ha...

Page 62: ...he following 1 Confirm the sensor is firmly attached to the circuit board connection plug 2 Remove the sensor wires form the connection plug by releasing holding tension on the plugs tension tab 3 Use an ohmmeter to test the electrical resistance of the sensor 4 Measure the air temperature near the sensor and compare the required resistance against measured resistance See chart in reference sectio...

Page 63: ...s If the louver does not operate with command from the remote control either the indoor board is bad or the louver motor is defective It is more likely the motor is defective than the board Make sure the louver assembly is not binding and keeping the vanes from moving 1 Remove power from the unit and remove the indoor unit cover 2 Access the circuit board 3 Identify the inoperable louver motor on ...

Page 64: ...rform the following test 1 Access the electrical control box 2 Unplug the float switch from the circuit board 3 The pump should start 4 If the pump does not start check for voltage at the pump connector on the board There should be 230 Volts AC to the pump If there is not the circuit board is defective If there is proper voltage to the pump either the pump or associated pump wiring is defective 2 ...

Page 65: ...ROLLER M SENSOR TEMP ROOM ROOM CARD CN3 CN6 T5A 250VAC CN16 DRAIN PUMP M CN9 CN10 CN4 CN14 FUSE FLOAT SWITCH CN13 CN4 CN3 CN2 CN7 CN1 CN6 INTELLIGENT MOVE EYE DEVICE M M LOUVER STEP MOTOR4 LOUVER STEP MOTOR3 M M LOUVER STEP MOTOR2 LOUVER STEP MOTOR1 INDOOR UNIT MAIN CONTROL BOARD I R RECEIVER INFRARED REMOTE RECEIVER TEMP TEMPERATURE ON OFF ON CN26 AB M FRESHAIR MOTOR EXTERNALALARM OUTPUT FUNCTION...

Page 66: ...p default OFF Cooling only ON High performance cassette OFF OFF ON Indoor unit Address Indoor unit address for one wired controller control more than one unit BM3 5 BM3 6 BM3 7 BM3 8 0 master OFF OFF OFF OFF 1 slave OFF OFF OFF ON 2 slave OFF OFF ON OFF 3 slave OFF OFF ON ON 4 slave OFF ON OFF OFF 5 slave OFF ON OFF ON 6 slave OFF ON ON OFF 7 slave OFF ON ON ON 8 slave ON OFF OFF OFF 9 slave ON OF...

Page 67: ...3 2B 23 Module thermal overload 4 4 2C 24 Compressor start failure over current 4 5 2D 25 Phase current protection IPM 4 6 2E 26 MCU reset 4 7 2F 27 Module current detect circuit malfunction 4 8 30 28 Liquid pipe sensor failure Circuit A 4 9 31 29 Liquid pipe sensor failure Circuit B 5 0 32 30 Liquid pipe sensor failure Circuit C 5 1 33 31 Liquid pipe sensor failure Circuit D 5 2 34 32 Gas pipe se...

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Page 69: ...verview F 2 Indoor Unit Circuit Board F 3 Ductwork Grilles F 5 Testing F 6 Test Condensate Pump and Float Switch F 6 Testing Communication Circuit F 6 Testing Temperature Sensors F 7 Indoor Fan Motor Voltage Check F 7 Wiring Diagram DIP Switch Settings F 8 Error Codes F 9 AD07SL2VHB AD09SL2VHB AD12SL2VHB AD18SL2VHB ...

Page 70: ...h remote control All operating status and information is displayed on the wired controller The Slim Duct unit does not have a display Slim Duct units are controlled by a wired controller only 8 8 6 4 4 2 2 7 5 5 3 3 1 1 Evaporator Coil Blower Assembly The indoor unit features a DC variable speed dual shaft blower motor that will change speed to match the capacity demand from the outdoor unit The m...

Page 71: ...eds to be pumped from the cassette The float switch connects onto the circuit board The float switch and pump are located behind the removable insulated cover next to the electrical control box The pump is hermetically sealed and requires no maintenance The float switch is a normally closed switch that opens as water rises The float switch requires no maintenance Gravity Drain Ports The indoor uni...

Page 72: ...oor unit capacity Air Delivery Power is set with DIP Switches SW1 4 and SW1 5 The settings are shown in Hydrostatic Selection of 0Pa up to 30Pa SW1 7 and SW1 8 define the unit type The conversions are as follows 0Pa 0 w c 10Pa 04 w c 20Pa 08 w c 30Pa 12 w c Recommended settings are for motorized Louver set to 10Pa Ducting limited to a total of 12 w c External Static set to 30Pa Components The Indo...

Page 73: ...tion Air distribution Air return blind Air return duct Indoor unit Rivet gluey nail heat preservation cotton tinfoil gluey nail cap adhesive tape Roof Installation Ceiling Air supply Unit Return air Return air box Roof Air outlet grill Air supply Unit Return air box Return air Long Duct Suspending hook Drain pipe Air return duct Air return blind Air out duct Transition duct Tie in of air Distribut...

Page 74: ...oes not start check for voltage at the control board pump connection There should be 230 Volts AC to the pump If there is not the circuit board is defective If there is proper voltage to the pump either the pump or associated pump wiring is defective Testing Communication Circuit If an Error E7 occurs perform the following test to determine if the indoor control board is functioning properly to se...

Page 75: ...the air temperature near the sensor and compare the required resistance against measured resistance refer to charts in reference section If the sensor is within calibration the sensor is good If the sensor is out of calibration replace the sensor Tube Sensors should be removed from socket and exposed to air temperature during test If The Indoor Fan Motor Does Not Run 1 Remove the front cover and a...

Page 76: ...IDGE CN22 CN23 ON SLAVE UNITS PCB SHOULD BE CUT OFF WHEN ONE WIRED CONTROLLER CONTROL MORE THAN ONE UNIT OFF OFF SW1 4 SW1 5 SW1 6 OFF OFF OFF ON TEMP SENSOR ROOM SENSOR PIPING TEMP ROOMCARD CN13 CN19 CN14 CH3 CN29 R O T O M N A F C D CN36 CN7 CN18 CN5 CN6 CN15 CN37 CN4 CH1 CH2 CN9 CN1 SW1 SW2 T5A 250VAC FUSE WIRED CONTROLLER RECEIVER FLOAT SWITCH U HOME REMOTE CENTRAL PANNEL CONTROLLER LEFT RIGHT...

Page 77: ...5 Phase current protection IPM 4 6 26 MCU reset 4 7 27 Module current detect circuit malfunction 4 8 28 Liquid pipe sensor failure Circuit A 4 9 29 Liquid pipe sensor failure Circuit B 5 0 30 Liquid pipe sensor failure Circuit C 5 1 31 Liquid pipe sensor failure Circuit D 5 2 32 Gas pipe sensor failure Circuit A 5 3 33 Gas pipe sensor failure Circuit B 5 4 34 Gas pipe sensor failure Circuit C 5 5 ...

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Page 79: ...G 6 Testing G 7 Test Condensate Pump and Associated Float Switch G 7 Testing Temperature Sensors G 7 Testing Communication Circuit G 8 Indoor Fan Motor Voltage Check G 8 Static Pressure Charts G 9 Board Replacement G 10 Removing the Condensate Pump G 10 Removing Fan Motor G 10 Replacing WiFi Module G 11 Wiring Diagram G 12 DIP Switch Settings G 13 Error Codes G 14 USYM09UCDSA USYM12UCDSA USYM18UCD...

Page 80: ...are accessed under the removable panel next to the electrical control box The wired controller can be configured to sense room air temperature There is no option for use with remote control All operating status and information is displayed on the wired controller The Mid Static Ducted unit does not have a display 8 9 6 4 2 2 7 5 3 3 1 1 Evaporator Coil Blower Assembly The indoor unit features a DC...

Page 81: ...ondensate pump The pump is connected to the circuit board The pump is energized whenever the Float Switch indicates that water needs to be pumped from the cassette The float switch connects onto the circuit board The float switch and pump are located behind the removable insulated cover next to the electrical control box The pump is hermetically sealed and requires no maintenance The float switch ...

Page 82: ...nge From the ground connection at the Terminal Block to the Number 3 screw connection the voltage should pulse up and down when data is being transmitted Line voltage to power the indoor unit comes in on Terminal Block connections 1 and 2 Power connects from these terminal connections to CH 1 and CH 2 on the circuit board If the board does not respond to commands and has no display check for line ...

Page 83: ... cycle will be active until one of the following occurs Fresh air function is canceled via the controller wired controller or wireless remote controller Indoor unit has been via the controller In Heating mode The fresh air output will maintain a 20 minutes ON 20 minutes OFF cycle after the compressor starts This cycle will be active until one of the following occurs Fresh air function is canceled ...

Page 84: ...on Air distribution Air return blind Air return duct Indoor unit Rivet gluey nail heat preservation cotton tinfoil gluey nail cap adhesive tape Roof Installation Ceiling Air supply Unit Return air Return air box Roof Air outlet grill Air supply Unit Return air box Return air Long Duct Suspending hook Drain pipe Air return duct Air return blind Air out duct Transition duct Tie in of air Distributio...

Page 85: ...b Test Condensate Pump and Associated Float Switch If the internal condensate pump does not operate the pump may be bad or the float switch may be defective Perform the following test 1 Access the electrical control box 2 Unplug the float switch from the circuit board 3 The pump should start 4 If the pump does not start check for voltage at the pump control board connection There should be 230 Vol...

Page 86: ... and 23VDC The fluctuating signal indicates a good communication path 3 If the voltage does not fluctuate and the wiring is good the indoor board is defective If The Indoor Fan Motor Does Not Run 1 Remove the front cover and access the fan motor circuit board connection 2 Reset power and turn the remote control fan command to Fan On mode Motor Test 1 If the motor doesn t run check for 310VDC betwe...

Page 87: ... 0 10 0 15 0 20 0 28 0 36 0 40 0 44 0 48 0 52 Air flow cfm Static pressure in wc AM09SL2VHA air flow and static pressure chart High cfm Med cfm Low cfm Quiet cfm USYM12UCDSA ENGLISH 350 0 400 0 450 0 500 0 550 0 600 0 650 0 0 10 0 15 0 20 0 28 0 36 0 40 0 44 0 48 0 52 0 60 Air flow cfm Static pressure in wc AM18SL2VHA air flow and static pressure chart High cfm Med cfm Low cfm Quiet cfm 400 0 450 ...

Page 88: ...all connectors from the board 3 Remove the 2 board mounting screws and remove the board 2 Unplug the pump motor and float switch wires from within the air inlet 3 Remove the 4 screws holding the pump in place 4 Tilt the pump out from the top and pull out 5 Pull wires through rubber grommets and remove pump assembly Removing Fan Motor 1 Remove control board cover 2 Unplug motor wires ...

Page 89: ...e screws holding the blower housing to the unit 4 on each housing 8 Support the motor 2 people may be required at this time Loosen the 2 screws of the motor mount bracket and remove full assembly 9 Using a long 4mm hex wrench loosen the set screws from the blower wheel and remove from motor shaft Replacing WiFi Module 1 Unplug existing WiFi module 2 Insert new WiFi module 3 Replace the wifi passco...

Page 90: ...switches setting without technical support 4 Get details from trouble shooting list about LED indication 5 Abbreviation RD red W withe BLK black BLU blue GRN green YL yellow Y G yellow green E A O external alarm output Tr indoor unit ambient room temperature sensor Tp indoor unit pipe coil temperature sensor 6 The port CN4 CN10are dry contact output port for particular use do not connect other dev...

Page 91: ...arm output ON Without filter clean warning OFF With filter clean warning ON North America area OFF Non North America area ON Description SW3 1 SW3 2 SW3 3 SW3 4 Special fresh air Canadian ventilation mode Canada particular Area invalid OFF Special fresh air Canadian ventilation mode Canada particular Area valid ON Console MESP Duct OFF Cassette Reserved ON Auxiliary heater invalid OFF Auxiliary he...

Page 92: ...4 3 23 Module thermal overload 4 4 24 Compressor start failure over current 4 5 25 Phase current protection IPM 4 6 26 MCU reset 4 7 27 Module current detect circuit malfunction 4 8 28 Liquid pipe sensor failure Circuit A 4 9 29 Liquid pipe sensor failure Circuit B 5 0 30 Liquid pipe sensor failure Circuit C 5 1 31 Liquid pipe sensor failure Circuit D 5 2 32 Gas pipe sensor failure Circuit A 5 3 3...

Page 93: ... Front Cover Removal H 4 Control Box Removal H 4 Board Replacement H 4 Upper Louver Removal H 5 Lower Damper Assembly Removal H 5 Replace Fan Motor H 5 Indoor Fan Motor Test Procedure H 6 Testing Temperature Sensors H 7 Testing Louver Motors H 7 Testing Communication Circuit H 8 Replacing WiFi Module H 8 Wiring Diagram DIP Switch Settings H 9 Error Codes H 10 USYF09UCDWA USYF12UCDWA USYF18UCDWA ...

Page 94: ...ent Temperature Sensor senses room temperature This sensor provides room temperature information to the ECU for calculation of inverter capacity and temperature control WiFi Module Coil Sensor The Coil Temperature Sensor senses indoor coil temperature in the cooling mode and in the heating mode This sensor is used for Anti Freezing and Anti Cold Blow cycles The sensor also provides critical temper...

Page 95: ... power the indoor unit is made on terminal block connections 1 and 2 Power connects from these terminal connections to CH 3 and CH 4 on the circuit board If the board does not respond to command and has no display check for line voltage at these connections When power is present at the indoor board the Display Power Indicator will be lit The control board has a replaceable 3 15A 250V fuse that pro...

Page 96: ...ntal louver Lift up the top edge of the front cover and then pull forward Control Box Removal 1 Remove the screw from the right side of the box cover 2 Lift up the panel that contains the diagnostic port wifi module and ambient sensor And remove the box cover 3 Unplug the three connectors for the fan motor upper louver and bottom damper 4 Remove the ground screw 5 Remove the mounting screw for the...

Page 97: ...ate the bottom of the assembly outward Note When re installing the damper assembly first place the front edge of the condensate drain pan into place then rotate the bottom of the assembly into position Replace Fan Motor 1 Remove filter cover front panel control box upper louver and bottom damper 2 Remove the white plastic strap that hold the line set in place on the right side of the unit 3 Locate...

Page 98: ...n air cover and access the fan motor circuit board connection 3 Reset power and turn the remote control fan command to Fan On mode Motor Test 1 If the motor doesn t run check for 310VDC between Pins 1 and 3 If it is not present the indoor board is bad If voltage is present continue on 2 Check the voltage between Pins 3 and 4 The voltage should be 15VDC If it is not present the board is bad If volt...

Page 99: ...breviation R red B black BL blue W white Y G yellow green TEMP temperature E A O exrernal alarm output Tr indoor unit room temperature sensor Tp indoor unit pipe temperature sensor coil temperature sensor Wired c display 07 flas upper Outdoo 20 cor HEX co Tp Tr SW1 1 OFF OFF SW1 2 OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF OFF ON SW1 3 SW1 4 SW1 5 SW1 6 SW1 7 SW...

Page 100: ...nit are correct There should no splices between the indoor and outdoor unit wiring connecting terminals 1 or 3 Make sure wiring is correct before performing this test 1 Measure the DC voltage between terminals 1 and 3 on the indoor terminal block 2 The voltage should fluctuate between 8VDC and 23VDC The fluctuating signal indicates a good communication path 3 If the voltage does not fluctuate and ...

Page 101: ... unit pipe temperature sensor coil temperature sensor Wire disp 07 upp Out 20 HEX Tp Tr SW1 1 OFF OFF SW1 2 OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF OFF ON SW1 3 SW1 4 SW1 5 SW1 6 SW1 7 SW1 8 To Outdoor Unit All Console default MODEL DIP switches factory default setting L2 L1 Note SW1 LED5 LED4 250VAC T5A FUSE CN20 CN22 22 1 CN31 CN11 CN35 Main control board S...

Page 102: ...M F9 26 MCU reset F24 27 Module current detect circuit malfunction F10 28 Liquid pipe sensor failure Circuit A F16 29 Liquid pipe sensor failure Circuit B F17 30 Liquid pipe sensor failure Circuit C F18 31 Liquid pipe sensor failure Circuit D F29 32 Gas pipe sensor failure Circuit A F30 33 Gas pipe sensor failure Circuit B F31 34 Gas pipe sensor failure Circuit C F32 35 Gas pipe sensor failure Cir...

Page 103: ...s Related to the IPM I 18 Error Codes Related to Compressor Outdoor Fan 4 Way Valve I 19 Flow Charts I 20 1 Outdoor EEPROM Malfunction I 20 2 Outdoor IPM over current or short circuit I 20 4 Communication abnormal between PCB and IPM I 21 6 DC voltage or AC voltage high I 21 8 Discharge temperature too high protection I 22 9 DC fan motor fault I 22 10 Outdoor defrosting temp sensor Te abnormal I 2...

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Page 105: ...mes within 5 seconds You will hear 2 beeps as confirmation Forced Defrost This will force the unit to run a Defrost Cycle Wireless Controller Set the unit to HEAT 30 C and High fan speed Press the Sleep button 6 times within 5 seconds You will hear 3 beeps as a confirmation Indoor Temperature Display Highwall Only This function will allow you to set the display to show either the Ambient temperatu...

Page 106: ...ress the ON OFF button on the remote control to save the changes Series IDU IDU PCB part number Controls Needed Guide Reference Haier GEA Controller IR Reciever Wired Controller 3X3 Cassette AL24LP2VHA 0151800208 WJ26X23559 YR HBS01 Unplug 1 2X2 Cassette AB09SC2VH 0151800208A WJ26X23785 YR HBS01 Unplug 3 2X2 Cassette AB12SC2VH 0151800208A WJ26X23785 YR HBS01 Unplug 3 2X2 Cassette AB18SC2VH 0151800...

Page 107: ...er from the indoor unit PCB 2 Apply power to the unit 3 Press the ON OFF button on the remote control HBS 01 4 Ignore this step if the display temperature is already O C Press MENU O F button to switch the display temperature to O C then press confirm 5 Set the remote controller for HEAT mode operation and set the temperature to 24O C 6 Aim the controller at the infrared signal receiver and press ...

Page 108: ...C A 18 18 36K D 18 24 42K A B 24 24 48K B C A x2 Three Zone 9 9 9 27K E 12 9 7 28K E 12 9 9 30K E 12 12 7 31K E 18 7 7 32K 12 12 9 33K E 18 9 7 34K 18 9 9 36K 12 12 12 36K E 18 12 7 37K 24 7 7 38K C A 18 12 9 39K 24 9 7 40K C A 24 9 9 42K C A 18 12 12 42K 24 12 7 43K C A 24 12 9 45K C A 18 18 12 48K D 24 12 12 48K C A Four Zone 7 7 7 7 28K E 9 7 7 7 30K E 9 9 7 7 32K E 12 7 7 7 33K E 9 9 9 7 34K E...

Page 109: ...22 11 33 26 521 592 18 73 4 23 10 86 25 283 563 66 75 2 24 10 42 24 111 536 65 77 25 10 00 23 511 08 78 8 26 9 60 21 947 486 94 F C Normal KΩ 10K SENSORS 23K SENSORS 50K SENSORS 80 6 27 9 21 20 949 464 05 82 4 28 8 85 20 003 442 35 84 2 29 8 50 19 104 421 77 86 30 8 16 18 252 402 24 87 8 31 7 84 17 442 383 72 89 6 32 7 54 16 674 366 13 91 4 33 7 25 15 943 349 43 93 2 34 6 97 15 249 333 58 95 35 6 ...

Page 110: ...e 383 Ω 388 Ω 390 Ω 195 Ω Violet 381 Ω 385 Ω 189 Ω Yellow 388 Ω 193 Ω Orange 196 Ω Red EEV 6 pin 6 wire White Yellow Orange Blue Brown Red White OL 92 Ω OL 46 Ω OL Yellow OL 92 Ω OL 46 Ω Orange OL 46 Ω OL Blue OL 46 Ω Brown OL Red EEV 6 pin 5 wire White Yellow Orange Blue X Red White 92 Ω 92 Ω 92 Ω 46 Ω Yellow 92 Ω 92 Ω 46 Ω Orange 92 Ω 46 Ω Blue 46 Ω X Red Highwall Horizontal Louver Motor Orange ...

Page 111: ... 6 Vdc GND 1MΩ 5 Blank Blank Blank 4 GND GND GND 3 Vcc GND 1MΩ 2 Vsp GND 135KΩ 1 FG GND 1MΩ DC Fan Motor Pin Identification PIN Color Abbr Definition 1 Blue FG Revolution Pulse Output 2 Yellow Vsp Speed Control Voltage Input 3 White Vcc Control Power Voltage Input 4 Black GND Ground 5 Blank Blank Blank 6 Red Vdc Motor Driver Voltage Input DC Motor 310 VDC DC Ground 15 VDC Signal Feedback Red Black...

Page 112: ...ambient temperature sensor Indoor heat exchanger temp sensor ASH220NCDWA ASH324NCDWA Comp ressor Discharge temp sensor Oil separator Capillary tube Ø2 7 Ø1 0 1400 High pressure switch 4 way valve Pipe sensor Toci Suction temp sensor Ts Low pressure switch Accumulator Gas service valve Outdoor heat exchanger temp sensor FAN OUT Outdoor ambient temperature sensor Ta Defrost sensor Td Distributor Str...

Page 113: ...Receiver Liquid service valve 5 8 3 8 Unit A liquid pipe temp sensor Tc2 Strainer EEV A Indoor unit A Unit B liquid pipe temp sensorTc2 Strainer EEV B Indoor unit B Unit C liquid pipe temp sensor Tc2 Strainer EEV C Indoor unit C Unit A gas pipe temp sensor Tc1 Unit B gas pipe temp sensor Tc1 Unit C gas pipe temp sensor Tc1 Indoor unit A Indoor unit B Indoor unit C 4 way valve coil OFF ON Refrigera...

Page 114: ...ensor failure F6 F6 3 2 13 13 13 Discharge temperature sensor failure F25 F25 3 3 14 High outdoor suction temperature F30 F30 3 4 14 PFC circuit loop voltage 15 15 15 Communication failure between the indoor outdoor unit E7 E7 3 5 16 16 16 Lack of refrigerant or discharging F13 F13 3 6 17 17 17 4 way valve switching failure F14 F14 3 7 18 18 18 Loss of synchronism detection F11 F11 3 8 19 Position...

Page 115: ... 5 2 5 19 25 2 6 1A 2 6 2 6 2 6 1A 26 2 7 1B 2 7 2 7 2 7 1B 27 2 8 1C 2 8 2 8 2 8 1C 28 2 9 1D 2 9 2 9 2 9 1D 29 3 0 1E 3 0 3 0 3 0 1E 30 3 1 1F 3 1 3 1 3 1 1F 31 3 2 20 3 2 3 2 3 2 20 32 3 3 21 3 3 3 3 3 3 21 33 22 34 3 4 22 3 4 3 4 3 4 22 34 3 5 23 3 5 3 5 3 5 23 35 3 6 24 3 6 3 6 3 6 24 36 3 7 25 3 7 3 7 3 7 25 37 3 8 26 3 8 3 8 3 8 26 38 27 39 3 9 27 3 9 3 9 3 9 27 39 28 40 4 0 28 4 0 4 0 4 0 ...

Page 116: ...ensing temperature sensor F36 F36 5 9 40 Liquid pipe sensor failure Circuit E F33 F33 6 0 41 Toci temperature sensor failure F38 F38 6 1 42 42 High Pressure switch open F39 F39 6 2 43 43 Low Pressure switch open F40 F40 6 3 44 44 System high pressure protection Overcharged high condensing temperature or malfunction of fan motor F41 F41 6 4 45 45 System low pressure protection Undercharged low defr...

Page 117: ... 35 53 5 4 36 5 4 5 4 5 4 36 54 5 5 37 5 5 5 5 5 5 37 55 5 6 38 5 6 5 6 5 6 38 56 39 57 5 7 39 5 7 5 7 5 7 39 57 5 8 3A 5 8 5 8 5 8 3A 58 5 9 3B 5 9 5 9 5 9 3B 59 6 0 3C 6 0 6 0 6 0 3C 60 6 1 3D 6 1 6 1 6 1 3D 61 6 2 3E 6 2 6 2 6 2 3E 62 6 3 3F 6 3 6 3 6 3 3F 63 6 4 40 6 4 6 4 6 4 40 64 6 5 41 6 5 6 5 6 5 41 65 42 66 0 1 01 0 1 0 1 0 1 01 01 0 2 02 0 2 0 2 0 2 02 02 0 4 04 0 4 0 4 0 4 04 04 0 7 07...

Page 118: ... the calibration of the sensors The measured resistance must be within the tolerances located in the tables There are 16 potential Error Codes that can be generated by the PCB to indicate a failure of an outdoor unit temperature sensor When the system generates an error code it will be displayed on the Service Monitor Board the number of flashes on the PCB and also on the indoor unit display panel...

Page 119: ...g Mode Overcharge Undersized refrigerant lines or excessive length Restriction Note If the refrigerant pressures are correct yet the system does not close the error reporting pressure switch replace the defective pressure switch Low Low Pressure Pressure Switch Switch High Pres High Pres sure sure Switch Switch Error Code 45 This code is indicating that system pressure is too low Typical Causes of...

Page 120: ...B Check the wiring and the connections CN9 on the PCB and CN15 on the IPM If the connections are good yet the boards do not communicate and the code will not clear check for correct voltage at the IPM CN15 connection If the communication voltage is correct and the high voltage input is present replace the IPM If the communication voltage is not correct replace the PCB Error Code 5 The IPM is prote...

Page 121: ... Possible Causes Overcharge Dirty outdoor coil Hot conditioned space temperature or high load Refrigeration circuit restriction Seized compressor Defective IPM Error Codes Related to Compressor Outdoor Fan 4 Way Valve Error Code 9 This code indicates the outdoor fan motor is not running The fault is detected very quickly by the PCB The system will shut off and display this error code If this error...

Page 122: ... causes EEPROM is bad Loose EEPROM wiring Correct the wiring Is electric box wiring correct and is compressor wiring firmly connected Is compressor normal compressor coil resistor insulation Is power module normal Replace compressor Replace power module Yes Yes Yes No No No Solve or correct any failures according to relative information 2 Outdoor IPM over current or short circuit ASH324NCDWA Input...

Page 123: ...ce No The filter board is broken replace the filter board No 4 Communication abnormal between PCB and IPM Control board can not communicate with the compressor driver module for over 4 minutes Possible causes The communication wire is bad The PCB is bad The power module is bad Correct power supply Is power supply voltage normal Is electric box wiring correct Is power module voltage between termina...

Page 124: ...ture over 115 C Error clears within 3 minutes if temperature lowers below 115 C Error status lock if it occurs 3 times in 1 hour Possible causes The sensor is bad or fixed bad The system is clogged The system lack of refrigerant The valve opening is wrong Replace wire and test again Are the fan motor wires conductive Is the motor running Power off and rotate the fan motor by hand Does it turn free...

Page 125: ...The temperature acquired by PCB is not accurate Replace wire Is the communication wire is shorted Is the communication wire CN21 is disconnected Reconnect Reconnect Yes No No Yes Is the wiring connection sequence correct according to the wiring diagram No Measure the outdoor terminal block voltage between communication 3 and N and measure the indoor terminal block between communication 3 and N to ...

Page 126: ...in the 4 way valve No Replace 4 way valve Yes No Adjust the valve opening Yes Is the electronic expansion valve over throttled 17 4 way valve reversing failure Indoor pipe indoor ambient temperature Tm Tai 5 C 10 minutes after compressor started Error status locks if it occurs 3 times in 1 hour Possible causes The 4 way valve is bad The PCB is bad The 4 way valve coil connection is bad The system ...

Page 127: ...pressor correct Is power module is normal Correct the wiring according to diagram Replace power module Yes Yes No No Compressor load too high find the reason Yes Is compressor is normal compressor coil resistor insulation No Replace compressor No 24 Compressor startup failure Compressor start failure has been detected by driver module Possible causes The power supply is abnormal Incorrect compress...

Page 128: ...Power off Is pressure switch wiring connection ok Use multimeter to check the high pressure switch Is the switch short circuited Is the EEV coil wiring correct and firmly in place Is the stop valve is open Use a multimeter to check the resistance of Tc Tm Are they withing range Is the piping system clogged Is the connection pipe bent The pressure is bad replace it Open the stop valve Clean the pip...

Page 129: ...sensor detection value is incorrect Refrigerant overcharge Blocked liquid line piping The outdoor unit cannot be turned on normally due to failure to open outdoor heat exchanger electronic expansion valve when heating The operation environment is beyond the allowed range Power on Short the low pressure switch terminal on the PCB Does the system report a failure Is the fan motor ok Is the resistanc...

Page 130: ...www geappliances com ductless GE Appliances A Haier Company Appliance Park Louisville KY 40225 2020 GE Appliances A Haier Company Issued Date 10 08 2020 ...

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