ZenAire MOB30-18HDN1-MQ0W Service Manual Download Page 82

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oubleshooting



Page 78

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5.7 E7 (Indoor PCB /Display board communication error)

Description

: Indoor PCB does not receive feedback from Display board for 120 seconds.

Recommended parts to prepare:

• Wiring mistake

• Faulty PCB

• Display board malfunction

Troubleshooting and repair:

Power off, then restart the unit

2 minutes later.

Is it still displaying

the error code?

Check the wirings and

connection.

YES

The unit is operating normally.

Are all the

connections

good?

Correct the connection

or replace the Wirings.

Replace the indoor main

PCB.

YES

Is the error

extinguished?

Replace the Display board.

Summary of Contents for MOB30-18HDN1-MQ0W

Page 1: ...ZENAIRE INVERTER 16 SEER SERVICE MANUAL ...

Page 2: ......

Page 3: ...Modes and Functions 4 Maintenance and Disassembly 18 1 Maintenance 2 Disassembly 5 Troubleshooting 57 1 Safety Caution 2 General Troubleshooting 3 Error Diagnosis and Troubleshooting Without Error Code 4 Quick Maintenance by Error Code 5 Troubleshooting by Error Code Appendix 85 i Temperature Sensor Resistance Value Table for T1 T2 T3 and T4 C K ii Temperature Sensor Resistance Value Table for TP ...

Page 4: ......

Page 5: ...Contents 1 In Case of Accidents or Emergency 2 2 Pre Installation 2 3 Operation and Maintenance 2 Safety Precautions ...

Page 6: ...m electri cal work For more information contact your dealer seller or an authorized Midea service center CAUTION While unpacking be careful of sharp edges around the unit as well as the edges of the fins on the con denser and evaporator 3 Operation and Maintenance WARNING Do not use defective or under rated circuit breakers Ensure the unit is properly grounded and that a dedicated circuit and brea...

Page 7: ...Contents 1 Model Reference 4 2 Electrical Wiring Diagrams 5 2 1 Indoor Unit 5 2 2 Outdoor Unit 7 Specifications ...

Page 8: ...nt Indoor Unit Model Outdoor Unit Model Capacity Btu Power Supply MSAFA 09HRDN1 BN10W MOBA30 09HDN1 BQ0W 9K 115V 60Hz 1Phase MSAFB 12HRDN1 BN10W MOBA30 12HDN1 BQ0W 12K MSAFA 09HRDN1 MN10W MOBA30 09HDN1 MQ0W 9K 208 230V 60Hz 1Phase MSAFB 12HRDN1 MN10W MOBA30 12HDN1 MQ0W 12K MSAFC 18HRDN1 MN10W MOB30 18HDN1 MQ0W 18K MSAFD 24HRDN1 MN10W MOCA30 23HDN1 MQ0W 24K ...

Page 9: ...ature of Indoor Heat Exchanger MSAFA 09HRDN1 BN10W MSAFA 09HRDN1 MN10W MSAFB 12HRDN1 BN10W MSAFB 12HRDN1 MN10W MSAFC 18HRDN1 MN10W MSAFD 24HRDN1 MN10W INDOOR WIRING DIAGRAM P1 P2 HEATER X Y E 12V 5V HA HB To CCM Comm Bus or 485 Wire controller To Randomly Connected Wire controller To Remote Switch To Remote Alarm 4 3 This symbol indicates the element is optional the actual shape shall prevail 1 3 ...

Page 10: ...N Alternating Current FAN DC FAN Direct Current FAN CT1 AC Current Detector COMP Compressor T3 Coil Temperature of Condenser T4 Outdoor Ambient Temperature TH Compressor Suction Temperature TP Compressor Discharge Temperature EEV Electric Expansive Valve L PRO Low Pressure Switch H PRO High Pressure Switch ...

Page 11: ...ions Page 7 MOBA30 09HDN1 BQ0W MOBA30 12HDN1 BQ0W Y G 4 WAY OPTIONAL DC FAN CN 7 AC FAN CN 25 PAN HEATER CRANKCASE HEATER BROW N TO I N D O O R U N I T 3 2 L N BLUE Y G 1 Y G Y G Y G Y G Y G BLACK W V RED BLUE U ...

Page 12: ...ENT TEMP SENSOR CONDENSER TEM P SENSOR Y G Y G Y G U V W BLUE RED BLACK AC FAN CAPACITOR Y G Y G Y G MOB30 18HDN1 MQ0W MOCA30 23HDN1 MQ0W Y G RED TO I NDO O R UNI T PO W ER SUPPLY BLACK BLUE OPTIONAL 16022000019211 HEATER 2 CN4 CN5 OUTDOOR WIRING DIAGRAM 3 Applicable to the units adopting DC motor only Applicable to the units adopting AC motor only CN30 BROWN BLUE YELLOW CN3 ...

Page 13: ...Specifications Page 9 PCB board of MOBA30 09HDN1 BQ0W MOBA30 12HDN1 BQ0W PCB board of MOBA30 09HDN1 MQ0W MOBA30 12HDN1 MQ0W ...

Page 14: ...3 Green LED3 Red IU display 1 standby for normal ON OFF 2 Operation normally OFF ON 3 IPM malfunction or IGBT over strong current protection FLASH OFF P0 4 Over voltage or too low voltage protection ON ON P1 5 EEPROM parameter error ON FLASH E5 6 Inverter compressor drive error OFF FLASH P4 7 Inverter compressor drive error FLASH ON P4 8 Inverter compressor drive error FLASH OFF P4 ...

Page 15: ...Mode 13 1 6 Heating Mode 14 1 7 Auto mode 14 1 8 Drying Mode 14 1 9 Forced Operation Function 14 1 10 Sleep Function 15 1 11 Auto Restart Function 15 1 12 Refrigerant Leakage Detection 15 1 13 8 C Heating Optional 15 1 14 Self Clean Optional 15 1 15 Follow Me Optional 15 1 16 Silence Optional 15 1 17 Information Inquiry 15 Product Features ...

Page 16: ... ceases operation Automatic shutoff based on fan speed If the indoor fan speed registers below 300RPM for an extended period of time the unit ceases operation and the corresponding error code is displayed on the indoor unit Inverter module protection The inverter module has an automatic shutoff mechanism based on the unit s current voltage and temperature If automatic shutoff is initiated the corr...

Page 17: ...he compressor ceases operation When T1 Ts T 3 C the compressor continues operation When the AC is operating in mute mode the compressor operates at a low frequency When the current exceeds the preset value the current protection function activates and the compressor ceases operation 1 5 2 Indoor Fan Control In cooling mode the indoor fan operates continuously The fan speed can be set to high mediu...

Page 18: ... If any one of the following conditions is satisfied defrosting ends and the machine switches to normal heating mode T3 rises above TCDE1 C T3 maintained above TCDE2 C for 80 seconds Unit runs for 15 minutes consecutively in defrosting mode 1 6 5 Evaporator Temperature Protection When the evaporator temperature exceeds a preset protection value the compressor stops 1 7 Auto mode This mode can be s...

Page 19: ... area from freezing if unoccupied during severe cold weather 1 14 Self clean Optional If you press Self Clean when the unit is in cooling or drying mode For cooling models the indoor unit will run in low fan mode for a certain time then ceases operation For heat pump models the indoor unit will run in fan only mode then low heat and finally in fan only mode Self Clean keeps the indoor unit dry and...

Page 20: ...mperature Ambient temperature Outlet temperature of indoor coil Discharge temperature Suction temperature Targeted frequency Actual frequency IF Indoor fan speed 0 1 2 3 4 14 FF OFF Low speed Medium speed High speed Turbo Actual fan speed is equal to the display value converted to decimal value and multiplied by 10 This is measured in RPM N A Used for some large capacity motors Used for some small...

Page 21: ...Product Features Page 17 Displayed code Explanation Displayed value Meaning Additional Notes A0 Reserved 0 FF 2 28 5 20 5 25 A1 0 1 2 3 4 5 6 L A U T A 5 T ...

Page 22: ...nce 19 1 1 First Time Installation Check 19 1 2 Refrigerant Recharge 21 1 3 Re Installation 22 1 3 1 Indoor Unit 22 1 3 2 Outdoor Unit 24 2 Disassembly 26 2 1 Indoor Unit 26 2 2 Outdoor Unit 38 Maintenance and Disassembly ...

Page 23: ...revent air and moisture from affecting the air conditioner s performance the indoor unit as well as the pipes between the indoor and outdoor unit must be be leak tested and evacuated Leak test soap water method Use a soft brush to apply soapy water or a neutral liquid detergent onto the indoor unit connections and outdoor unit connections If there is gas leakage bubbles will form on the connection...

Page 24: ...e evacuating for an additional 20 minutes If the pressure does not achieve 0 1 MPa 14 5 Psi after 50 minutes check for leakage If the pressure successfully reaches 0 1 MPa 14 5 Psi fully close the Handle Lo valve then cease vacuum pump operations b Wait for 5 minutes then check whether the gauge needle moves after turning off the vacuum pump If the gauge needle moves backwards check whether there ...

Page 25: ...alve at the bottom of the cylinder If the refrigerant is R410A invert the cylinder to ensure a complete liquid charge 4 Partially open the Handle Lo manifold valve 5 Open the valve at the bottom of the cylinder for 5 seconds to purge the air in the charge hose then fully tighten the charge hose with the push pin of Handle Lo to the gas service port of the 3 way valve 6 Place the charging cylinder ...

Page 26: ...e 3 way valve s gas service port 3 Open the Handle Lo manifold valve to purge air from the charge hose for 5 seconds and then close it quickly 4 Close the 2 way valve 5 Operate the air conditioner in cooling mode Cease operations when the gauge reaches 0 1 MPa 14 5 Psi 6 Close the 3 way valve so that the gauge rests between 0 3 MPa 43 5 Psi and 0 5 MPa 72 5 Psi 7 Disconnect the charge set and moun...

Page 27: ...d meter indicates 0 1 MPa 14 5 Psi If the meter does not indicate 0 1 MPa 14 5 Psi after 30 minutes continue evacuating for an additional 20 minutes If the pressure does not achieve 0 1 MPa 14 5 Psi after 50 minutes check for leakage If the pressure successfully reaches 0 1 MPa 14 5 Psi fully close the Handle Lo valve then cease vacuum pump operations d Wait for 5 minutes then check whether the ga...

Page 28: ...cuate the system for approximately one hour Confirm that the compound meter indicates 0 1 MPa 14 5Psi 4 Close the valve Low side on the charge set and turn off the vacuum pump Wait for five minutes then check whether the gauge needle moves after turning off the vacuum pump If the gauge needle moves backward check whether there is gas leakage 5 Disconnect the charge hose from the vacuum pump 6 Moun...

Page 29: ...e with the push pin of Handle Lo to the gas service port of the 3 way valve 6 Place the charging cylinder onto an electronic scale and record the starting weight 7 Fully open the Handle Lo manifold valve 2 and 3 way valves 8 Operate the air conditioner in cooling mode and charge the system with liquid refrigerant 9 When the electronic scale displays the correct weight refer to the gauge and the pr...

Page 30: ...ation 1 Hold the front panel by the tabs on the both sides and lift it see CJ_AF_ INV_001 2 Push up the bottom of an air filter and then pull it out downwards see CJ_AF_INV_002 CJ_AF_INV_001 CJ_AF_INV_002 Note This section is for reference only Actual unit appearance may vary Front Panel Tab Filter ...

Page 31: ...he hook towards left to open it see CJ_AF_INV_003 4 Bend the horizontal louver lightly by both hands to loosen the hooks then remove the horizontal louver see CJ_AF_INV_004 CJ_AF_INV_003 CJ_AF_INV_004 Note This section is for reference only Actual unit appearance may vary Hook Horizontal Louver Hook ...

Page 32: ...cover see CJ_AF_INV_005 1 and CJ_AF_INV_005 2 6 Disconnect the connector for display board see CJ_AF_INV_005 3 7 Remove the display board see CJ_AF_ INV_005 4 CJ_AF_INV_005 Note This section is for reference only Actual unit appearance may vary CJ_AF_INV_005 1 CJ_AF_INV_005 2 CJ_AF_INV_005 3 CJ_AF_INV_005 4 ...

Page 33: ...ion 8 Open the screw caps 2 and the remove the screws see CJ_AF_ INV_006 9 Release the 4 hooks 10 Release the seven hooks in the back see CJ_AF_INV_007 CJ_AF_INV_006 CJ_AF_INV_007 Note This section is for reference only Actual unit appearance may vary Hooks ...

Page 34: ... Illustration 11 Pull out the panel frame while pushing the hook through a clearance between the panel frame and the heat exchanger see CJ_AF_INV_008 CJ_AF_INV_008 Note This section is for reference only Actual unit appearance may vary Panel Frame ...

Page 35: ...ove the cover of electronic box and the terminal cover see CJ_AF_ INV_009 2 Pull out the room temperature sensor T1 and the coil temperature sensor T2 see CJ_AF_INV_010 3 Remove the two screws used for the ground connection see CJ_AF_ INV_010 CJ_AF_INV_009 CJ_AF_INV_010 Note This section is for reference only Actual unit appearance may vary T1 Sensor Ground Screws T2 Sensor Fixing Screw Electronic...

Page 36: ...ight image to remove it CJ_AF_INV_011 2 6 Disconnect the wires Then remove the electronic main board CJ_AF_ INV_012 CJ_AF_INV_011 2 CJ_AF_INV_012 Note This section is for reference only Actual unit appearance may vary Fixing Screw Electronic Box Indoor Fan Motor Applicable to AC Motor Only Swing Motor Display Board Pipe Temperature Sensor Room Temperature Sensor CJ_AF_INV_011 1 ...

Page 37: ...ly Page 33 Procedure Illustration 7 Remove the fixing screw then remove the capacitor of fan motor see CJ_AF_ INV_013 CJ_AF_INV_013 Note This section is for reference only Actual unit appearance may vary Capacitor of Fan Motor ...

Page 38: ... Disassemble the pipe holder located at the rear of the unit see CJ_AF_INV_014 2 Remove the screws on the evaporator located at the fixed plate see CJ_AF_ INV_015 3 Remove the two screws on the evaporator located at the base of the bearing side see CJ_AF_INV_016 CJ_AF_INV_014 CJ_AF_INV_015 CJ_AF_INV_016 Note This section is for reference only Actual unit appearance may vary Pipe Holder Screws Scre...

Page 39: ...Maintenance and Disassembly Page 35 Procedure Illustration 4 Pull out the evaporator see CJ_AF_ INV_017 CJ_AF_INV_017 Note This section is for reference only Actual unit appearance may vary Evaporator ...

Page 40: ...tor and fan Procedure Illustration 1 Remove the two screws and remove the fixing board of the fan motor see CJ_AF_ INV_018 2 Remove the Bearing sleeve see CJ_AF_ INV_019 3 Remove the fixing screw see CJ_AF_ INV_020 4 Pull out the fan motor and fan assembly from the side CJ_AF_INV_018 CJ_AF_INV_019 CJ_AF_INV_020 Note This section is for reference only Actual unit appearance may vary Fixing Screw Sc...

Page 41: ...ectrical parts refer to 1 Front panel 2 Electrical parts before disassembling step motor Procedure Illustration 1 Remove the two screws then remove the stepping motor see CJ_AF_INV_021 CJ_AF_INV_021 Note This section is for reference only Actual unit appearance may vary Stepping Motor ...

Page 42: ...tioner and the power breaker 2 Remove the screws of the big handle and then remove the big handle 3 screws see CJ_BA30_INV_001 3 Remove the screws of the top cover and then remove the top cover 3 screws One of the screws is located underneath the big handle see CJ_ BA30_INV_002 CJ_BA30_INV_001 CJ_BA30_INV_002 Note This section is for reference only Actual unit appearance may vary Top Cover ...

Page 43: ...he front panel and then remove the front panel 7 screws see CJ_BA30_INV_003 5 Remove the screws of the rear net and then remove the rear net 2 screws see CJ_BA30_INV_004 CJ_BA30_INV_003 CJ_BA30_INV_004 Note This section is for reference only Actual unit appearance may vary Front Panel ...

Page 44: ...Page 40 Procedure Illustration 6 Remove the screws of the right panel and then remove the right panel 5 screws see CJ_BA30_INV_005 CJ_BA30_INV_005 Note This section is for reference only Actual unit appearance may vary Right Panel ...

Page 45: ...crews of the big handle and then remove the big handle 3 screws see CJ_B30_INV_001 3 Remove the screws of the top cover and then remove the top cover 3 screws One of the screws is located underneath the big handle see CJ_ B30_INV_002 CJ_B30_INV_001 CJ_B30_INV_002 Note This section is for reference only Actual unit appearance may vary Top Cover ...

Page 46: ...n remove the front panel 8 screws see CJ_B30_INV_003 5 Remove the screws of water collecting cover and then remove the water collecting cover 1 screw see CJ_B30_ INV_004 CJ_B30_INV_003 CJ_B30_INV_004 Note This section is for reference only Actual unit appearance may vary Front Panel Water Collecting Cover ...

Page 47: ... Page 43 Procedure Illustration 6 Remove the screws of the right panel and then remove the right panel 5 screws see CJ_B30_INV_005 CJ_B30_INV_005 Note This section is for reference only Actual unit appearance may vary Right Panel ...

Page 48: ...rews of the big handle and then remove the big handle 3 screws see CJ_CA30_INV_001 3 Remove the screws of the top cover and then remove the top cover 3 screws One of the screws is located underneath the big handle see CJ_ CA30_INV_002 CJ_CA30_INV_001 CJ_CA30_INV_002 Note This section is for reference only Actual unit appearance may vary Top Cover ...

Page 49: ...remove the front panel 7 screws see CJ_CA30_INV_003 5 Remove the screws of water collecting cover and then remove the water collecting cover 1 screw see CJ_ CA30_INV_004 CJ_CA30_INV_003 CJ_CA30_INV_004 Note This section is for reference only Actual unit appearance may vary Front Panel Water Collecting Cover ...

Page 50: ...Page 46 Procedure Illustration 6 Remove the screws of the right panel and then remove the right panel 6 screws see CJ_CA30_INV_005 CJ_CA30_INV_005 Note This section is for reference only Actual unit appearance may vary Right Panel ...

Page 51: ...MOB30 18HDN1 MQ0W Procedure Illustration 1 Remove the nut securing the fan with a spanner see CJ_ODU_ INV_001 2 Remove the fan 3 Remove the screws of the top cover 2 screws see CJ_ODU_INV_002 4 Unfix the hooks and then open the electronic control box cover 4 hooks see CJ_ODU_INV_003 CJ_ODU_INV_001 CJ_ODU_INV_002 CJ_ODU_INV_003 Note This section is for reference only Actual unit appearance may vary...

Page 52: ...nector for fan motor from the electronic control board see CJ_ODU_INV_004 6 Remove the fixing screws of the fan motor 4 screws see CJ_ODU_INV_005 7 Remove the fan motor CJ_ODU_INV_004 CJ_ODU_INV_005 Note This section is for reference only Actual unit appearance may vary Fan Motor ...

Page 53: ...ove the nut securing the fan with a spanner see CJ_ODU_ INV_006 2 Remove the fan 3 Unfix the hooks and then open the electronic control box cover 4 hooks see CJ_ODU_INV_007 CJ_ODU_INV_006 CJ_ODU_INV_007 Note This section is for reference only Actual unit appearance may vary Hook D cut ...

Page 54: ...nector for fan motor from the electronic control board see CJ_ODU_INV_008 5 Remove the fixing screws of the fan motor 4 screws see CJ_ODU_INV_009 6 Remove the fan motor CJ_ODU_INV_008 CJ_ODU_INV_009 Note This section is for reference only Actual unit appearance may vary Fan Motor ...

Page 55: ...Illustration 1 Remove the connector for the compressor see CJ_ODU_INV_010 2 Pull out the two blue wires connected with the four way valve CJ_ODU_ INV_010 3 Pull out connectors of the condenser coil temp sensor T3 outdoor ambient temp sensor T4 and discharge temp sensor TP CJ_ODU_INV_010 4 Disconnect the electronic expansion valve wire CJ_ODU_INV_010 5 Then remove the electronic control box see CJ_...

Page 56: ...temp sensor T4 and discharge temp sensor T5 see CJ_ODU_INV_011 4 Disconnect the electronic expansion valve wire see Fig CJ_ODU_INV_011 5 Remove the connector for electric heaters see Fig CJ_ODU_INV_011 6 Remove the connector for the DR and reactor see Fig CJ_ODU_INV_011 7 Then remove the electronic control box see Fig CJ_ODU_INV_011 CJ_ODU_INV_011 Note This section is for reference only Actual uni...

Page 57: ...the panel plate electrical parts and fan assembly refer to 1 Panel plate 2 Electrical parts and 3 Fan assembly before disassembling sound blanket Procedure Illustration 1 Remove the sound blanket side and top see CJ_ODU_INV_012 CJ_ODU_INV_012 Note This section is for reference only Actual unit appearance may vary Sound Blanket side Sound Blanket top ...

Page 58: ...cal parts and fan assembly refer to 1 Panel plate 2 Electrical parts and 3 Fan assembly before disassembling four way valve Procedure Illustration 1 Heat up the brazed parts and then detach the the four way valve and the pipe see CJ_ODU_INV_013 2 Remove the four way valve assembly with pliers CJ_ODU_INV_013 Note This section is for reference only Actual unit appearance may vary ...

Page 59: ...fan assembly refer to 1 Panel plate 2 Electrical parts and 3 Fan assembly before disassembling compressor Procedure Illustration 1 Remove the flange nut of terminal cover and remove the terminal cover see CJ_ ODU_INV_014 2 Disconnect the connectors see CJ_ODU_ INV_015 CJ_ODU_INV_014 CJ_ODU_INV_015 Note This section is for reference only Actual unit appearance may vary Terminal Cover ...

Page 60: ...he bottom plate see CJ_ODU_INV_016 4 Heat up the brazed parts and then remove the the discharge pipe and the suction pipe see CJ_ODU_INV_017 5 Lift the compressor from the base pan assembly with pliers CJ_ODU_INV_016 CJ_ODU_INV_017 Note This section is for reference only Actual unit appearance may vary Discharge Pipe Suction Pipe ...

Page 61: ...ameter error 70 5 3 E1 Indoor and outdoor unit communication error 71 5 4 E2 Zero crossing detection error diagnosis and solution 73 5 5 E3 F5 Fan speed has been out of control diagnosis and solution 74 5 6 E4 E5 F1 F2 F3 Open circuit or short circuit of temperature sensor diagnosis and solution 77 5 7 E7 Indoor PCB Display board communication error 78 5 8 EC Refrigerant Leakage Detection diagnosi...

Page 62: ...ent protection diagnosis and solution 81 5 11 P1 Over voltage or too low voltage protection diagnosis and solution 82 5 12 P2 High temperature protection of IPM module diagnosis and solution 83 5 13 P4 Inverter compressor drive error diagnosis and solution 84 ...

Page 63: ...ischarged before troubleshooting For other models connect discharge resistance approx 100Ω 40W or a soldering iron plug between the positive and negative terminals of the electrolytic capacitor The terminals are located on the bottom surface of the outdoor PCB Note This picture is for reference only Actual appearances may vary Electrolytic Capacitors ...

Page 64: ... EC Refrigerant leak detected Page 79 1 time ON F0 Overload current protection Page 80 2 times ON F1 Outdoor ambient temperature sensor T4 open circuit or short circuit Page 77 3 times ON F2 Condenser coil temperature sensor T3 is in open circuit or has short circuited Page 77 4 times ON F3 Compressor discharge temperature sensor TP open circuit or short circuit Page 77 5 times ON F4 Outdoor unit ...

Page 65: ... field maintenance Problem Solution 1 Unit will not start Page 64 65 2 The power switch is on but fans will not start Page 64 65 3 The temperature on the display board cannot be set Page 64 65 4 Unit is on but the wind is not cold hot Page 64 65 5 Unit runs but shortly stops Page 64 65 6 The unit starts up and stops frequently Page 64 65 7 Unit runs continuously but insufficient cooling heating Pa...

Page 66: ...6 67 5 Condenser Outdoor fan will not start Page 66 67 6 Unit runs but shortly stops Page 66 67 7 Compressor short cycles due to overload Page 66 67 8 High discharge pressure Page 66 67 9 Low discharge pressure Page 66 67 10 High suction pressure Page 66 67 11 Low suction pressure Page 66 67 12 Unit runs continuously but insufficient cooling Page 66 67 13 Too cool Page 66 67 14 Compressor is noisy...

Page 67: ...x Outdoor fan motor x x x X x x x x x Temperature sensor x x x x x x T2 Sensor x x x x x x x x Additional refrigerant x x x x x x x x x Compressor x x x x x x x x IPM board x x x x x x x x x Outdoor unit x x x x x x x x Display board x x x x x x x x Part requiring replacement Error Code F1 F2 F3 F4 F5 P0 P1 P2 P4 Indoor PCB x x x x x x x x x Outdoor PCB Reactor x x x x x x x x Indoor fan motor x x...

Page 68: ...ng frequently Unit will not start The power switch is on but fans will not start The temperature on the display board cannot be set Unit is on but the wind is not cold hot Unit runs but shortly stops The unit starts up and stops frequently Unit runs continuously but insufficient cooling heating Cool can not change to heat Unit is noisy Test method remedy Test voltage Close the power switch Inspect...

Page 69: ...t or outlet of either unit is blocked Interference from cell phone towers and remote boosters Shipping plates remain attached Check heat load Tighten bolts or screws Close all the windows and doors Remove the obstacles Reconnect the power or press ON OFF button on remote control to restart Remove them Others ...

Page 70: ...rt Condenser Outdoor fan will not start Unit runs but shortly stops Compressor short cycles due to overload High discharge pressure Low discharge pressure High suction pressure Low suction pressure Unit runs continuously but insufficient cooling Too cool Compressor is noisy Horizontal louver can not revolve Test method remedy Test voltage Inspect fuse type size Inspect connections tighten Test cir...

Page 71: ...bulb Heavy load condition Loosen hold down bolts and or screws Shipping plates remain attached Poor choices of capacity Contact of piping with other piping or external plate Replace the compressor Leak test Replace restricted part Clean or replace Clean coil Check fan Change charged refrigerant volume Clean condenser or remove obstacle Purge evacuate and recharge Remove obstruction to air flow Rem...

Page 72: ...sors Room temp T1 sensor Indoor coil temp T2 sensor Outdoor coil temp T3 sensor Outdoor ambient temp T4 sensor Compressor discharge temp Tp sensor Measure the resistance value of each winding by using the multi meter 5 1 2 Compressor checking Measure the resistance value of each winding by using the tester Position Resistance Value ASN98D22UFZ ASM135D23UFZ ATF235D22UMT Blue Red 1 57Ω 1 75Ω 0 75Ω B...

Page 73: ...tween P and UVWN UVW and N Digital tester Normal resistance value Digital tester Normal resistance value Red Black Several MΩ Red Black Several MΩ P N U N U V V W W Red 5 1 4 Fan Motor Measure the resistance value of each winding by using the tester Model YKT 32 6 202L YKT 32 6 3L YKT 48 6 206 YKT 63 6 200L Brand Tongde Welling Welling Welling Black Red Main Ω 86 213 152 88 5 Blue Black AUX Ω 64 1...

Page 74: ... it on 2 minutes later Is it still displaying the error code The unit is operating normally NO If the EEPROM chip is welded on main PCB replace the main PCB directly Otherwise check if the EEPROM chip plugged in main PCB well YES Is it plugged well Correct the connection NO Replace the indoor outdoor main PCB Remarks The location of the EEPROM chip on the indoor and outdoor PCB is shown in the fol...

Page 75: ...rmally NO Measure Vs Vs is the voltage between S and N of outdoor unit Red pan S Black pan N YES Is the voltage moving alternately between Positive and negative Check the outdoor wiring connection Is it normal Check the reactor YES Is it normal Replace the outdoor PCB Power on YES Is the error resolved Replace the indoor PCB NO Replace the reactor NO Check the indoor wiring connections Is it norma...

Page 76: ...mal running the voltage will move alternately between 25V to 25V If the outdoor unit has malfunction the voltage will move alternately with positive value While if the indoor unit has malfunction the voltage will be a certain value Use a multimeter to test the resistance of the reactor which does not connect with capacitor The normal value should be around zero ohm Otherwise the reactor must have ...

Page 77: ...feedback for 4 minutes or the zero crossing signal time interval is abnormal Recommended parts to prepare Connection mistake PCB faulty Troubleshooting and repair Check the connections and power supply Correct the connections Turn on the unit when the power supply is good NO Indoor main PCB is defective Replace indoor main PCB YES Is it normal ...

Page 78: ...ure F5 Recommended parts to prepare Wiring mistake Faulty fan assembly Faulty fan motor Faulty PCB Troubleshooting and repair YES Power off then restart the unit after 2 minutes Is it within normal parameters Replace the fan motor Does a problem remain The unit is operating normally NO Shut off the power supply Rotate the fan by hand YES Does it turn easily Find the cause of the problem and resolv...

Page 79: ... No Color Signal Voltage 1 Red Vs Vm 280V 380V 2 3 Black GND 0V 4 White Vcc 14 17 5V 5 Yellow Vsp 0 5 6V 6 Blue FG 14 17 5V DC motor voltage input and output voltage 115V No Color Signal Voltage 1 Red Vs Vm 140V 190V 2 3 Black GND 0V 4 White Vcc 14 17 5V 5 Yellow Vsp 0 5 6V 6 Blue FG 14 17 5V 2 Outdoor DC Fan Motor control chip is in outdoor PCB Release the UVW connector Measure the resistance of ...

Page 80: ... set the unit running in fan mode at high fan speed After running for 15 seconds measure the voltage of pin1 and pin2 If the value of the voltage is less than 100V 208 240V power supply or 50V 115V power supply the PCB must has problems and need to be replaced ...

Page 81: ... than 4 94V the LED will display the failure Recommended parts to prepare Wiring mistake Faulty sensor Faulty PCB Troubleshooting and repair Check the connection between temperature sensor and PCB Replace indoor or outdoor PCB Is it within acceptable parameters Is it properly wired Ensure proper connections NO Measure the resistance value of the sensor YES Replace the Sensor NO YES ...

Page 82: ...g mistake Faulty PCB Display board malfunction Troubleshooting and repair Power off then restart the unit 2 minutes later Is it still displaying the error code Check the wirings and connection YES The unit is operating normally NO Are all the connections good Correct the connection or replace the Wirings NO Replace the indoor main PCB YES Is the error extinguished Replace the Display board NO ...

Page 83: ...ns 3 times the display area will show EC and AC will turn off Recommended parts to prepare Faulty T2 sensor Faulty indoor PCB System problems such as leakage or blockages Troubleshooting and repair Power off then restart the unit 2 minutes later Are any leakages present Check System for blockages and clear blockages if present Does a problem remain Put your hands in front of the indoor air outlet ...

Page 84: ...ake Compressor malfunction Check the power supply Do any exist Are they within acceptable parameters Are they properly connected Is it in working order Replace the outdoor unit Is it in working order Check system for blockages YES Stop the unit NO Clear the blockage NO Check the compressor resistance values YES Replace the compressor NO Check the connections and wires YES Ensure proper connections...

Page 85: ...alfunction Faulty outdoor PCB Check the wiring between PCB and compressor Does an error exist Ensure proper connections or replace the wires and connectors YES Check the IPM NO Is it in working order Replace the IPM board or replace the outdoor PCB NO Check the outdoor fan and the outdoor unit ventilation YES Is it in working order Please refer to the solution of the Fan Speed is Out of Control ma...

Page 86: ...e Faulty PCB Check the power supply Is it in working order Turn off the unit NO Check the connections and wires YES Are they in working order Ensure proper connections or replace the wires NO Power on and measure the voltage between P and N YES While the unit is in standby is the voltage between P and N is around DC 310V 340V or 380V When start up the unit is it in 220V 400V Replace the IPM board ...

Page 87: ...e of IPM module is higher than setting value the LED displays this failure code Recommended parts to prepare Faulty PCB Connection problems Troubleshooting and repair Check the fastening screws on the PCB and IPM radiator Are they fixed tightly Replace the outdoor control PCB Tighten the screws and apply silicon grease NO YES ...

Page 88: ...y outdoor fan assembly Compressor malfunction Faulty outdoor PCB Check the wiring between the PCB and compressor Is it improperly wired Ensure proper connections or replace the wires and connectors YES Check the IPM NO Is it functioning properly Replace the IPM board or replace the outdoor PCB NO Check the outdoor fan and the outdoor unit ventilation YES Is it functioning properly Please refer to ...

Page 89: ...Contents i Temperature Sensor Resistance Value Table for T1 T2 T3 and T4 C K 86 ii Temperature Sensor Resistance Value Table for TP C K 87 iii T F 9 T C 5 88 iv Pressure On Service Port 89 Appendix ...

Page 90: ...171 1 29078 117 243 0 38991 2 28 39 8239 38 100 5 62961 78 172 1 25423 118 244 0 37956 1 30 37 1988 39 102 5 39689 79 174 1 2133 119 246 0 36954 0 32 35 2024 40 104 5 17519 80 176 1 17393 120 248 0 35982 1 34 33 3269 41 106 4 96392 81 178 1 13604 121 250 0 35042 2 36 31 5635 42 108 4 76253 82 180 1 09958 122 252 0 3413 3 37 29 9058 43 109 4 5705 83 181 1 06448 123 253 0 33246 4 39 28 3459 44 111 4...

Page 91: ... 78 75 167 8 084 115 239 2 422 4 25 222 8 36 97 34 32 76 169 7 82 116 241 2 357 3 27 211 4 37 99 32 94 77 171 7 566 117 243 2 294 2 28 200 7 38 100 31 62 78 172 7 321 118 244 2 233 1 30 190 5 39 102 30 36 79 174 7 086 119 246 2 174 0 32 180 9 40 104 29 15 80 176 6 859 120 248 2 117 1 34 171 9 41 106 28 81 178 6 641 121 250 2 061 2 36 163 3 42 108 26 9 82 180 6 43 122 252 2 007 3 37 155 2 43 109 25...

Page 92: ...201 2 125 257 4 39 2 33 91 4 64 147 2 95 203 126 258 8 4 5 40 1 34 93 2 65 149 96 204 8 127 260 6 5 41 35 95 66 150 8 97 206 6 128 262 4 6 42 8 36 96 8 67 152 6 98 208 4 129 264 2 7 44 6 37 98 6 68 154 4 99 210 2 130 266 8 46 4 38 100 4 69 156 2 100 212 131 267 8 9 48 2 39 102 2 70 158 101 213 8 132 269 6 10 50 40 104 71 159 8 102 215 6 133 271 4 11 51 8 41 105 8 72 161 6 103 217 4 134 273 2 12 53...

Page 93: ...29 44 95 35 105 40 56 115 46 11 120 48 89 PSI 70 59 93 94 106 116 119 113 117 125 147 154 PSI 75 63 97 99 115 125 124 120 126 132 155 162 PSI 80 67 103 104 123 138 135 129 132 140 162 173 PSI 90 73 112 113 139 152 149 138 145 154 180 189 F C ODT IDT 0 17 5 15 15 9 44 45 7 22 75 23 89 85 29 44 95 35 105 40 56 115 46 11 120 48 89 MPA 70 59 0 64 0 65 0 73 0 8 0 82 0 78 0 81 0 86 1 01 1 06 MPA 75 63 0...

Page 94: ...T 57 53 13 89 11 67 47 43 8 33 6 11 37 33 2 78 0 56 27 23 2 78 5 17 13 8 33 10 56 0 2 17 19 17 18 27 28 PSI 55 439 413 367 330 302 268 239 PSI 65 471 435 386 368 339 297 276 PSI 75 489 457 403 381 362 312 290 F C ODT IDT 57 53 13 89 11 67 47 43 8 33 6 11 37 33 2 78 0 56 27 23 2 78 5 17 13 8 33 10 56 0 2 17 19 17 18 27 28 MPA 55 3 03 2 85 2 53 2 28 2 08 1 85 1 65 MPA 65 3 25 3 00 2 66 2 54 2 33 2 0...

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