MrCool DIY-MULTI2-18HP230C Service Manual Download Page 89

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Troubleshooting 3

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1. Safety Caution

WARNING

Be sure to turn off all power supplies or disconnect all wires to avoid electric shock.
While checking indoor/outdoor PCB, please equip oneself with antistatic gloves or wrist
strap to avoid damage to the board.

WARNING

Electricity remains in capacitors even when the power supply is off.
Ensure the capacitors are fully discharged before troubleshooting.

Test the voltage between P and N on back of the main PCB with multimeter. If the voltage is lower than 36V, the
capacitors are fully discharged.

Note: This picture is for reference only. Actual appearance may vary.

Summary of Contents for DIY-MULTI2-18HP230C

Page 1: ...4TH GENERATION MULTI ZONE SERVICE MANUAL...

Page 2: ......

Page 3: ...erence 2 Pipe Length and Drop Height 3 Indoor units combination 4 Refrigeration Cycle Diagrams 5 Electrical Wiring Diagrams Electronic Functions 1 Abbreviation 2 Electric Control Working Environment 3...

Page 4: ...int Check Function 6 Error Diagnosis and Troubleshooting Without Error Code 7 Quick Maintenance by Error Code 8 Troubleshooting by Error Code 9 Check Procedures Appendix i Temperature Sensor Resistanc...

Page 5: ......

Page 6: ...Contents 1 Precautions 2 2 Information servicing For flammable materials 3 Safety Precautions...

Page 7: ...d perform electri cal work For more information contact your dealer seller or an authorized service center CAUTION While unpacking be careful of sharp edges around the unit as well as the edges of the...

Page 8: ...work taking place the area around the equipment is to be surveyed to make sure that there are no flammable hazards or ignition risks NO SMOKING signs shall be displayed 2 7 Ventilated area Ensure tha...

Page 9: ...on of refrigerant in the atmosphere from a leak 2 12 Cabling Check that cabling will not be subject to wear corrosion excessive pressure vibration sharp edges or any other adverse environmental effect...

Page 10: ...use of reclaimed refrigerant It is essential that electrical power is available before the task is commenced Become familiar with the equipment and its operation Isolate system electrically Before at...

Page 11: ...iated electrical components are sealed to prevent ignition in the event of a refrigerant release Consult manufacturer if in doubt The recovered refrigerant shall be returned to the refrigerant supplie...

Page 12: ...Contents 1 Model Reference 2 2 Pipe Length and Drop Height 3 3 Indoor units combination 4 4 Refrigeration Cycle Diagrams 5 5 Electrical Wiring Diagrams 7 Specifications...

Page 13: ...wing table to determine the specific outdoor unit model Outdoor Unit Model Capacity Btu h Power Supply DIY MULTI2 18HP230C 18k 208 230V 60Hz 1Phase DIY MULTI3 27HP230C 27k DIY MULTI4 36HP230C 36k DIY...

Page 14: ...charge pipe lengthxN x0 16oZ ft Caution Refrigerant pipe diameter is different according to indoor unit to be connected When using the extension pipe refer to the tables below When refrigerant pipe d...

Page 15: ...24 9 9 9 9 12 9 24 9 9 12 9 18 18 9 9 9 12 18 12 12 9 9 18 12 12 12 9 9 9 18 24 12 18 9 9 24 12 12 18 9 9 12 12 12 24 9 12 12 12 18 18 9 9 12 18 18 18 9 12 18 12 12 24 9 12 12 12 12 12 12 12 3 4 Indo...

Page 16: ...12 9 9 12 18 9 12 12 18 12 12 12 18 9 9 9 9 12 9 9 12 12 12 9 9 9 18 9 9 12 24 9 12 12 24 12 12 12 24 9 9 9 9 18 9 9 12 12 18 9 9 9 24 9 9 12 30 9 12 12 30 12 12 18 18 9 9 9 9 24 9 12 12 12 12 9 9 9 3...

Page 17: ...4 Refrigeration Cycle Diagrams 4 1 Refrigeration Cycle Diagram of inverter 1 drive 2 type 4 2 Refrigeration Cycle Diagram of inverter 1 drive 3 type...

Page 18: ...4 3 Refrigeration Cycle Diagram of inverter 1 drive 4 type 4 4 Refrigeration Cycle Diagram of inverter 1 drive 5 type...

Page 19: ...Model ODU Printed Circuit Board IPM Printed Circuit Board DIY MULTI2 18HP230C 17122000051368 DIY MULTI3 27HP230C 17122300001076 17122000018251 DIY MULTI4 36HP230C 17122300001076 17122000018251 DIY MU...

Page 20: ...5 8...

Page 21: ......

Page 22: ......

Page 23: ...MAIN CONTROL BOARD REVERSING VALVE ELECTRONIC EX PANSIVE VALVE HEAT_D CHASSIS HEATER HEAT_Y COMP TOP OLP TEMP SENSOR COMP TOP 16022000036851...

Page 24: ...Outdoor unit printed circuit board diagram 17122000051368...

Page 25: ...s heater 208 230V AC when is ON CN36 5 4 WAY CN38 connect to 4 way valve 208 230V AC when is ON 6 HEAT_Y CN8 connect to compressor heater 208 230V AC when is ON CN20 7 T2B CN28 connect to evaporator c...

Page 26: ...Name CN Meaning 13 COMPRESSOR U connect to compressor V 0V AC standby W 10 200V AC running 14 DC FAN CN32 connect to DC fan Note This section is for reference only Please take practicality as standar...

Page 27: ...Outdoor unit printed circuit board diagram 17122300001076...

Page 28: ...08 230V AC when is ON CN6 14 4 way CN1 connect to 4 way valve 208 230V AC when is ON CN2 15 Fan C CN13 connect to fan capacitor 16 Outdoor AC Fan CN11 connect to outdoor AC fan 17 Fan C CN10 connect t...

Page 29: ...Outdoor unit IPM board diagram 17122000018251...

Page 30: ...5 connect to main board N Out 2 CN_Reactor CN2 CN3 connect to reactor 3 CN_COMP CN_COMP connect to compressor 4 CN1 CN1 connect to main board CN21 5 FAN_DC CN14 connect to outdoor DC fan Note This sec...

Page 31: ...Outdoor unit printed circuit board diagram 17122000037804...

Page 32: ...N17 CN18 connect to 4 way valve 208 230V AC when is ON 7 AC FAN2 CN31 CN36 CN28 connect to AC fan2 8 AC FAN1 CN27 CN34 CN32 connect to AC fan1 9 H PRO L PRO CN10 connect to low high pressure switch 10...

Page 33: ...Outdoor unit IPM board diagram 17122000042012...

Page 34: ...board L Out CN2 connect to main board N Out 2 CN9 connect to main board CN6 3 FAN_DC FAN_1 FAN_2 connect to outdoor DC fan 1 DC fan 2 4 CN_COMP U1 connect to compressor V1 W1 Note This section is for...

Page 35: ...Contents 1 Abbreviation 2 2 Electric Control Working Environment 2 3 Main Protection 2 4 Control and Functions 3 Electronic Functions...

Page 36: ...discharge temperature of the compressor rises the running frequency is limited according to the following rules If TA TP TB maintain the current frequency If the temperature increase and TP TB decrea...

Page 37: ...ration 1 If the compressor frequency continues to be lower than the frequency set for setting time the unit raises the frequency to the frequency set for setting time and then resumes with the former...

Page 38: ...capacity Request Capacity request of indoor unit 40 modify rate ucOutHP x HeatT4OutHP HeatT4OutHP is effective for some models Note The final result is an integer If ucOutHP 1 round down otherwise rou...

Page 39: ...kes 10s to reach the critical point to be effective Select a lower gear for the first gear or super breeze speed 4 3 Four Way Valve Control In heating mode a four way valve is opened In defrosting a f...

Page 40: ...nit Table 2 2 Dimension 3 3 Outdoor Unit Disassembly 9 3 1 Panel Plate 9 3 2 Electrical Parts 20 3 3 Fan Assembly 37 3 4 Fan Motor 38 3 5 Sound blanket 39 3 6 Four way valve 40 3 7 Compressor 41 Outdo...

Page 41: ...tdoor Unit Disassembly 1 1 Outdoor Unit Table Outdoor Unit Model Panel Plate PCB Board DIY MULTI2 18HP230C X430 PCB board 6 DIY MULTI3 27HP230C D30 PCB board 2 DIY MULTI4 36HP230C D30 PCB board 2 DIY...

Page 42: ...Outdoor Unit Disassembly 3 2 Dimension 2 1 Panel Plate B30 1 drive 2...

Page 43: ...Outdoor Unit Disassembly 4 2 2 Panel Plate CA30 1 drive 2 1 drive 3 1 drive 4...

Page 44: ...Outdoor Unit Disassembly 5 2 3 Panel Plate CA30 1 drive 2 for US models...

Page 45: ...Outdoor Unit Disassembly 6 2 4 Panel Plate D30 1 drive 2 1 drive 3 1 drive 4 1 drive 5...

Page 46: ...Outdoor Unit Disassembly 7 2 5 Panel Plate D30 1 drive 3 1 drive 4 for US models...

Page 47: ...Outdoor Unit Disassembly 8 2 6 Panel Plate X330 1 drive 2...

Page 48: ...Outdoor Unit Disassembly 9 2 7 Panel Plate X430 1 drive 3...

Page 49: ...Outdoor Unit Disassembly 10 2 8 Panel Plate X430 1 drive 2 for US models...

Page 50: ...Outdoor Unit Disassembly 11 2 6 Panel Plate E30 1 drive 5 for US models...

Page 51: ...three screws and then remove the shield see CJ_Multi_D30 001 For US models remove four screws and then remove the big handle Remove three screws and then remove the water collecting cover see CJ_Multi...

Page 52: ...screws Two of the screws is located underneath the big handle see CJ_ Multi_D30 002 4 Remove the screws of the front right panel and then remove the front right panel 2 screws see CJ_Multi_D30 003 CJ_...

Page 53: ...and then remove the front panel 9 screws see CJ_Multi_D30 004 6 Remove the screws of the rear net and then remove the rear net 6 screws see CJ_Multi_D30 005 for some models CJ_Multi_D30 004 CJ_Multi_D...

Page 54: ...ation 7 Remove the screws of the right panel and then remove the right panel 12 screws see CJ_multi_D30 006 and CJ_Multi_D30 007 CJ_Multi_D30 006 CJ_Multi_D30 007 Note This section is for reference on...

Page 55: ...rew of the shield and then remove it 1 screw see CJ_ Multi_B30 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 se...

Page 56: ...screws of the front panel and then remove the front panel 8 screws see CJ_Multi_B30 003 5 Remove the screws of the right panel 10 screws see CJ_Multi_B30 004 CJ_Multi_B30 003 CJ_Multi_B30 004 Note Th...

Page 57: ...f the shield and then remove it 3 screws see CJ_ Multi_CA30 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 C...

Page 58: ...front panel and then remove the front panel 7 screws see CJ_Multi_CA30 003 5 Remove the screws of the right panel and then remove the right panel 12 screws see CJ_CA30_004 CJ_Multi_CA30 003 CJ_Multi_C...

Page 59: ...emove it 3 screws see CJ_Multi_E30 001 3 Remove the screws of the water collecting cover and then remove it 3 screws see CJ_Multi_E30 001 4 Unfix the four screws of the top cover and then remove it se...

Page 60: ...and then push it down to unhook the right fornt pannel from the nine hooks see CJ_Multi_E30 003 6 Remove the seven screws of the front panel and then remove the front panel see CJ_Multi_E30 004 CJ_Mu...

Page 61: ...ide of the right panel 9 screws see CJ_ Multi_E30 005 2 Remove the screws on the back of the right panel and then remove the right panel and rear net 9 screws see CJ_Multi_E30 006 CJ_Multi_E30 005 CJ_...

Page 62: ...wer breaker 2 Remove the screw of the shield and then remove it 1 screw see CJ_ Multi_X330_001 3 Remove the screws of the top cover and then remove the top cover 4 screws see CJ_Multi_X330_002 CJ_Mult...

Page 63: ...nt panel and then remove the front panel 8 screws see CJ_Multi_X330_003 5 Remove the screws of the right panel and then remove the right panel 9 screws see CJ_Multi_X330_005 CJ_Multi_X330_003 CJ_Multi...

Page 64: ...s remove the screws of big handle assembly and water collector then remove them 6 screws see CJ_Multi_X430_001 3 Remove the screws of the top cover and then remove the top cover 3 screws One of the sc...

Page 65: ...he front panel 7 screws see CJ_Multi_X430_003 5 Remove the screws of the right panel and then remove the right panel 14 screws two of them are used to fix the optional rear net see CJ_Multi_ X430_004...

Page 66: ...ate before disassembling electrical parts PCB Board 1 Procedure Illustration 1 Remove the screws of the ground wirings 3 screws CJ_Multi PCB_001 1 2 Unfix the hooks and screw and then open the electro...

Page 67: ...il temp sensor T3 outdoor ambient temp sensor T4 and discharge temp sensor TP see CJ_Multi PCB_001 3 7 Disconnect the electronic expansion valve wire see CJ_Multi PCB_001 3 8 Disconnect the communicat...

Page 68: ...n 1 Remove the screws of the top cover 2 screws CJ_Multi PCB_002 1 2 Unfix the screws and then turn over the IPM board 4 screws see CJ_ Multi PCB_002 2 CJ_Multi PCB_002 1 CJ_Multi PCB_002 2 Note This...

Page 69: ...e condenser coil temp sensor T3 outdoor ambient temp sensor T4 and discharge temp sensor TP see CJ_Multi PCB_002 4 7 Disconnect the electronic expansion valve wire see CJ_Multi PCB_002 4 8 Disconnect...

Page 70: ...e compressor see CJ_Multi PCB_003 3 5 Pull out the two blue wires connected with the four way valve CJ_Multi PCB_003 3 6 Pull out connectors of the condenser coil temp sensor T3 outdoor ambient temp s...

Page 71: ...Multi_PCB_003 4 10 Remove one screw of module board see CJ_Multi_PCB_003 5 11 Disconnect the connectors of the module board see CJ_Multi_ PCB_003 6 CJ_Multi PCB_003 4 CJ_Multi PCB_003 5 CJ_Multi PCB_0...

Page 72: ...Remove the screws and then remove the reactor 1 2 screws see CJ_ Multi_PCB_004 1 2 Remove the screws and then remove the reactor 2 see CJ_Multi_ PCB_004 2 CJ_Multi PCB_004 1 CJ_Multi PCB_004 2 Note T...

Page 73: ...s on the main board see CJ_Multi_PCB_004 3 5 Disconnect the connectors on the main board see CJ_Multi_PCB_004 3 6 Unfix two screws on the upper board see CJ_Multi_PCB_004 4 7 Remove the connectors on...

Page 74: ...Illustration 8 Unfix two screws on the bottom board see CJ_Multi_PCB_004 5 9 Disconnect the connectors on the bottom board see CJ_Multi_ PCB_004 5 CJ_Multi PCB_004 5 Note This section is for referenc...

Page 75: ...B_005 1 2 Pull out the wires from electrical supporting plate and turn over the electronic control assembly see CJ_ODU_Multi_PCB_005 2 3 Remove the electronic installing box subassembly 4 hooks see CJ...

Page 76: ...4 5 Disconnect the connectors from the electronic control board see CJ_ODU_Multi_PCB_005 5 6 Then remove the electronic control board 4 hooks see CJ_ODU_Multi_ PCB_005 6 CJ_ODU_Multi_PCB_005 4 CJ_ODU_...

Page 77: ...stalling box 2 screws see CJ_Multi_PCB_005 7 8 Remove one screw of module board see CJ_Multi_PCB_005 8 9 Disconnect the connectors of the module board see CJ_Multi_ PCB_005 9 CJ_Multi PCB_005 7 CJ_Mul...

Page 78: ...e CJ_ODU_Multi_ PCB_006 1 2 Cut the ribbon by a shear and disconnect the 4 way valve connector see CJ_ODU_Multi_ PCB_006 2 3 Ture over the electronic control box subassembly see CJ_ODU_Multi_ PCB_006...

Page 79: ...lectronic installing box subassembly 4 hooks see CJ_ODU_ Multi_PCB_006 4 5 Remove the support of electronic control box see CJ_ODU_Multi_ PCB_006 5 CJ_ODU_Multi_PCB_006 4 CJ_ODU_Multi_PCB_006 5 Note T...

Page 80: ...006 6 7 Remove 2 screws and then remove the electronic control board see CJ_ODU_Multi_PCB_006 6 8 Pull out the connector remove one screw and then remove the key board subassembly on terminal board se...

Page 81: ...e panel plate refer to 1 1 Panel Plate before disassembling fan Procedure Illustration 1 Remove the nut securing the fan with a spanner see CJ_ODU_ FAN_001 2 Remove the fan CJ_ODU_FAN_001 Note This se...

Page 82: ...or on PCB refer to 1 1 Panel Plate and 1 2 Electrical parts before disassembling fan motor Procedure Illustration 3 Remove the fixing screws of the fan motor 4 screws see CJ_ODU_MOTOR_001 4 Remove the...

Page 83: ...refer to 1 1 Panel plate before disassembling sound blanket Procedure Illustration 1 Remove the sound blanket side and top see CJ_ODU_BLANKET_001 CJ_ODU_BLANKET_001 Note This section is for reference...

Page 84: ...the two steps before heating up the brazed parts The operations above should be implemented by professionals Note Remove the panel plate connection of four way valve on PCB refer to 1 1 Panel plate an...

Page 85: ...eating up the brazed parts The operations above should be implemented by professionals Note Remove the panel plate connection of compressor on PCB refer to 1 1 Panel plate and 1 2 Electrical parts bef...

Page 86: ...om plate see CJ_ODU_COMP_003 4 Heat up the brazed parts and then remove the the discharge pipe and the suction pipe see CJ_ODU_COMP_004 5 Lift the compressor from the base pan assembly with pliers CJ_...

Page 87: ...8 2 EL 01 Indoor and outdoor units communication error diagnosis and solution 28 8 3 EH 03 EC 07 Fan speed is operating outside of the normal range EC 71 Over Current Failure of Outdoor DC Fan Motor...

Page 88: ...8 11 ODU PC 0A High temperature protection of condenser diagnosis and solution 43 8 12 EH 02 Zero crossing detection error diagnosis and solution 45 8 13 PC 02 ODU P0 Top temperature protection of co...

Page 89: ...gloves or wrist strap to avoid damage to the board WARNING Electricity remains in capacitors even when the power supply is off Ensure the capacitors are fully discharged before troubleshooting Test th...

Page 90: ...oil temperature sensor T3 is in open circuit or has short circuited TS33 5 times OFF EC 53 Outdoor room temperature sensor T4 is in open circuit or has short circuited TS33 5 times OFF EC 54 Compresso...

Page 91: ...fined by the service manual Ensure that this code is not a temperature reading Troubleshooting Test the unit using the remote control If the unit does not respond to the remote the indoor PCB requires...

Page 92: ...ompressor lack phase protection TS52 PC 44 Outdoor unit zero speed protection TS34 PC 45 Outdoor unit IR chip drive failure TS53 PC 46 Compressor speed has been out of control TS34 PC 49 Compressor ov...

Page 93: ...outlet C F Installation Condition Information Indoor temperature C F Indoor humidity RH Outdoor temperature C F Outdoor humidity RH Length of Connecting pipe Pipe diameter Gas pipe Liquid pipe Length...

Page 94: ...emperature T4 Ambient temperature Tb Outlet temperature of indoor coil TP Discharge temperature TH Sunction temperature FT Targeted Frequency Fr Actual Frequency IF Indoor fan speed OF Outdoor fan spe...

Page 95: ...two seconds which means the unit goes into parameter checking mode Use the LED or DO NOT DISTURB and SWING or AIR DIRECTION buttons to cycle through information displayed Pressing LED or DO NOT DISTU...

Page 96: ...ature 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...

Page 97: ...Troubleshooting 11 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 98: ...4 Forced defrostling A 3 Indoor unit A capacity The capacity unit is horse power If the indoor unit is not connected the digital display shows the following 9K 1HP 12K 1 2HP 18K 1 5HP 4 Indoor unit B...

Page 99: ...erature T1D 26 Indoor unit E room temperature T1E 27 Indoor unit A evaporator temperature T2A If the temperature is lower than 9o C the digital display shows 9 If the temperature is higher than 70o C...

Page 100: ...T3 or the current Bit6 Frequency limit caused by PFC Bit5 Frequency limit caused by T4 Bit4 Frequency limit caused by T2 Bit3 Frequency limit caused by T3 Bit2 Frequency limit caused by T5 Bit1 Frequ...

Page 101: ...e HP 9K 1HP 12K 1 2HP 18K 1 5HP 9 Indoor unit B capacity demand code 10 Indoor unit C capacity demand code 11 Indoor unit D capacity demand code 12 Indoor unit E capacity demand code 13 Outdoor unit a...

Page 102: ...orator temperature T2E 32 Condenser pipe temperature T3 33 Outdoor ambient temperature T4 34 Compressor discharge temperature TP The display value is between 30 129o C If the temperature is lower than...

Page 103: ...3 Bit2 Frequency limit caused by T5 Bit1 Frequency limit caused by current Bit0 Frequency limit caused by voltage 46 T2B fault 00 No fault 01 T2B A fault 02 T2B B fault 03 T2B C fault 04 T2B D fault 0...

Page 104: ...ce No Problem Solution 1 Unit will not start Page 20 21 2 The power switch is on but fans will not start Page 20 21 3 The temperature on the display board cannot be set Page 20 21 4 Unit is on but the...

Page 105: ...er Outdoor fan will not start Page 22 23 6 Unit runs but shortly stops Page 22 23 7 Compressor short cycles due to overload Page 22 23 8 High discharge pressure Page 22 23 9 Low discharge pressure Pag...

Page 106: ...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...

Page 107: ...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...

Page 108: ...art but fans run Compressor and condenser outdoor fan will not start Evaporator indoor fan will not start Condenser Outdoor fan will not start Unit runs but shortly stops Compressor short cycles due t...

Page 109: ...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...

Page 110: ...lowing table Part requiring replacement Error Code EH 00 EL 01 EH 03 EH 60 EH 61 O EC 50 EH 02 PC 02 EC 53 EC 52 EC 54 Indoor PCB x x x x x Outdoor PCB x x x x x Indoor fan motor x x x x x x x x x x T...

Page 111: ...an motor x x x x T3 Sensor x x x x x x x T4 Sensor x x x x x x x TP Sensor x x x x x x x T2B Sensor x x x x x x Reactor or inductance x x x Compressor x x x x x x IPM module board x x x x Bridge recti...

Page 112: ...x x x x x x Reactor or inductance x x x x x x x x Compressor x x x x x x x IPM module board x x x x x x x Bridge rectifier x x x x x x x x PFC module x x x x x x x x Additional refrigerant x x x x x...

Page 113: ...mally The unit is operating normally NO Shut off the power supply and turn it on 2 minutes later Shut off the power supply and turn it on 2 minutes later Is it still displaying the error code Is it st...

Page 114: ...ror diagnosis and solution Description Indoor unit does not receive the feedback from outdoor unit during 110 seconds and this condition happens 4 times continuously Recommended parts to prepare Indoo...

Page 115: ...te controller Is all indoor unit display Turn off the all indoor units Is IPM power LED or operating LED lamp On Yes A Is all the wiring between terminal and Indoor PCB connect ok No Yes A No Reconnec...

Page 116: ...the resistance of the reactor which does not connect with capacitor The normal value should be around zero ohm Otherwise the reactor must have malfunction Note The picture and the value are only for r...

Page 117: ...epair 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...

Page 118: ...ite Vcc 13 5 16 5V 5 Yellow Vsp 0 6 5V 6 Blue FG 13 5 16 5V 2 Outdoor DC Fan Motor control chip is in outdoor PCB Release the UVW connector Measure the resistance of U V U W V W If the resistance is n...

Page 119: ...es Sensors PCB Troubleshooting and repair Check the connection between temperature sensor and PCB Replace PCB Is it within acceptable parameters Is it properly wired Ensure proper connections NO Measu...

Page 120: ...trol PC 49 Compressor overcurrent failure Description An abnormal current rise is detected by checking the specified current detection circuit Recommended parts to prepare Outdoor PCB Connection wires...

Page 121: ...ormal refer according to Appendix Replace the bridge rectifier No Is the bridge rectifier functioning normally Is the wiring of the reactor or inductance properly wired Reconnect the wiring No Are the...

Page 122: ...re code and the AC turns off IDU PC 04 The driven chip cannot detect the right rotor position of compressor Recommended parts to prepare Connection wires IPM module board Outdoor fan assembly Compress...

Page 123: ...ctance normal Yes Replace reactor or inductance Replace reactor or inductance No Is the connecting wire between the main board and the IPM board connected tightly Is the connecting wire between the ma...

Page 124: ...rotection PC 12 Outdoor unit main control board DC bus high voltage protection 341 MCE error Diagnosis and Solution Description Abnormal increases or decreases in voltage are detected by checking the...

Page 125: ...easure whether the voltage between P and N is normal refer to 9 Check Procedures Measure whether the voltage between P and N is normal refer to 9 Check Procedures Replace the bridge rectifier Replace...

Page 126: ...and repair Communication malfunction between IPM board and outdoor main board Is there at least one LED in the IPM board light Check the signal wire between the IPM board and the main board is it conn...

Page 127: ...d the PFC module is connected tightly Yes Measure whether the voltage between P and N is normal refer to the Appendix Measure whether the voltage between P and N is normal refer to the Appendix No Che...

Page 128: ...ompressor discharge temp sensor and PCB according to wiring diagrams Check whether the connection is right between compressor discharge temp sensor and PCB according to wiring diagrams Measure the res...

Page 129: ...nosis and solution Description The unit will stop when condenser temperature is higher than 65 C and runs again when it is less than 52 C Recommended parts to prepare Connection wires Condenser temper...

Page 130: ...outdoor unit ventilate well Make the outdoor unit ventilate well Check whether the heat exchanger is dirty Check whether the heat exchanger is dirty No Clean the heat exchanger Clean the heat exchang...

Page 131: ...dback for 4 minutes or the zero crossing signal time interval is abnormal Recommended parts to prepare Connection wires Indoor main PCB Troubleshooting and repair Check the connections and power suppl...

Page 132: ...ir inlet and outlet or the heat exchanger of indoor and outdoor units Yes No Yes Yes Turn off the power supply and turn it on 10 minutes later Check if the temperature of compressor Top Is more than 9...

Page 133: ...ure protection diagnosis and solution Description Outdoor pressure switch cut off the system because high pressure is higher than 4 4 MPa Recommended parts to prepare Connection wires Pressure switch...

Page 134: ...nger dirty Is the heat exchanger dirty No Yes Replace outdoor main board Is the problem resolved Replace outdoor main board Is the problem resolved No High pressure protection High pressure protection...

Page 135: ...gnosis and solution Description Outdoor pressure switch cut off the system because low pressure is lower than 0 13 MPa the LED displays the failure code Recommended parts to prepare Connection wires O...

Page 136: ...ened Is the indoor fan running properly in cooling mode Is the indoor fan running properly in cooling mode No Yes Yes No Check whether the refrigerant system is functioning properly Check whether the...

Page 137: ...ded parts to prepare Connection wire Fan motor Outdoor PCB Troubleshooting and repair Check the fan three phase output for obvious open circuit Power off then restart the unit 2 minutes later Is it st...

Page 138: ...pare Connection wire Compressor Outdoor PCB Troubleshooting and repair Check the compressor three phase output for obvious open circuit Power off then restart the unit 2 minutes later Is it still disp...

Page 139: ...CB Troubleshooting and repair Power off then restart the unit 2 minutes later Replace the inverter module PCB Yes 8 19 ODU CE Automatic correction of wiring piping error Press the check switch on the...

Page 140: ...Unit Disassembly 2 Measure the resistance value of the sensor using a multi meter 3 Check corresponding temperature sensor resistance value table Refer to Chapter 8 Appendix Note The picture and the v...

Page 141: ...ATF235D22UMT ATF310D43UMT ATQ360D1UMU EAPQ420D1UMUA KTM180D68UMT Blue Red 1 72 0 75 0 65 0 37 0 37 1 91 Blue Black Red Black Resistance Value ASM135D23UFZ KTF310D43UMT KSN140D21UFZ KSN140D58UFZ KTN15...

Page 142: ...ply 2 Discharge electrolytic capacitors and ensure all energy storage unit has been discharged 3 Disassemble outdoor PCB or disassemble IPM board 4 Measure the resistance value between P and U V W N U...

Page 143: ...ground of the reactor The normal resistance should be around 0 1 ohm Otherwise the reactor must have malfunction 1 4 4 way valve Check 1 Power on use a digital tester to measure the voltage when the u...

Page 144: ...and disconnect power supply 2 Disconnect the connectors of EXV 3 Measure the resistance value between Red and Blue Yellow Brown and Orange White Resistance to EXV coil Color of lead wire Normal Value...

Page 145: ...Contents i Temperature Sensor Resistance Value Table for T1 T2 T3 and T4 C K 2 ii Temperature Sensor Resistance Value Table for TP for some units C K 3 iii Pressure On Service Port 4 Appendix...

Page 146: ...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...

Page 147: ...35 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 10...

Page 148: ...10 3 9 5 10 0 10 6 12 4 13 0 PSI 70 59 21 11 15 93 94 106 116 119 113 117 125 147 154 75 63 23 89 17 22 97 99 115 125 124 120 126 132 155 162 80 67 26 67 19 44 103 104 123 138 135 129 132 140 162 173...

Page 149: ...20 8 18 5 16 5 65 18 33 32 5 30 0 26 6 25 4 23 3 20 5 19 0 75 23 89 33 8 31 5 27 8 26 3 24 9 21 5 20 0 PSI 55 12 78 439 413 367 330 302 268 239 65 18 33 471 435 386 368 339 297 276 75 23 89 489 457 40...

Page 150: ...6 3 6 6 7 8 8 1 PSI 70 59 21 11 15 58 59 67 73 74 71 74 78 91 96 75 63 23 89 17 22 61 62 71 78 78 75 78 83 97 102 80 67 26 67 19 44 64 65 77 86 84 81 83 87 102 107 90 73 32 22 22 78 70 71 87 96 93 86...

Page 151: ...3 13 0 11 6 10 3 65 18 33 20 3 18 8 16 6 15 9 14 6 12 8 11 9 75 23 89 21 1 19 7 17 3 16 4 15 6 13 4 12 5 PSI 55 12 78 274 258 229 207 189 168 149 65 18 33 294 273 241 231 212 186 172 6 75 23 89 306 28...

Page 152: ...12 6 13 3 PSI 70 59 21 11 15 95 96 108 118 121 115 119 128 150 157 75 63 23 89 17 22 99 101 117 128 126 122 129 135 158 165 80 67 26 67 19 44 105 106 125 141 138 132 135 143 165 176 90 73 32 22 22 78...

Page 153: ...1 2 18 9 16 8 65 18 33 33 2 30 6 27 1 25 9 23 8 20 9 19 4 75 23 89 34 5 32 1 28 4 26 8 25 4 21 9 20 4 PSI 55 12 78 448 421 374 337 308 273 244 65 18 33 480 444 394 375 346 303 282 75 23 89 499 466 411...

Page 154: ...656 2200 22 319 55 512 131 922 750 7 5 108 75 13 249 55 848 2250 22 5 326 25 56 527 133 749 800 8 116 15 465 59 837 2300 23 333 5 57 526 135 547 850 8 5 123 25 17 58 63 644 2350 23 5 340 75 58 508 13...

Page 155: ...11 159 5 10 471 50 848 3350 33 5 485 75 53 935 129 083 1150 11 5 166 75 11 988 53 578 3400 34 493 54 593 130 267 1200 12 174 13 457 56 223 3450 34 5 500 25 55 243 131 437 1250 12 5 181 25 14 879 58 7...

Page 156: ...1 850 8 5 123 25 1 393 34 507 2600 26 377 41 977 107 559 900 9 130 5 3 209 37 777 2650 26 5 384 25 42 769 108 984 950 9 5 137 75 4 951 40 911 2700 27 391 5 43 55 110 39 1000 10 145 6 624 43 923 2750 2...

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Summary of Contents for DIY-MULTI2-18HP230C

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MrCool DIY-MULTI2-18HP230C, Service Manual

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Summary of Contents for DIY-MULTI2-18HP230C

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