Midea MOB31-12HFN1-QRD0GW Service Manual Download Page 57

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

PM continuity check

Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital

tester to measure the resistance between P and UVWN; UVW and N.

Digital tester

Normal resistance value

Digital tester

Normal resistance value

(+)Red

(-)Black

∞

(Several MΩ)

(+)Red

(-)Black

∞

(Several MΩ)

(+)Red

Summary of Contents for MOB31-12HFN1-QRD0GW

Page 1: ...All Easy 3D Inverter Series Service Manual 2017 ...

Page 2: ... running the system for many years 20 5 6 Re installation while the indoor unit need to be repaired 20 5 7 Re installation while the outdoor unit need to be repaired 21 6 Disassemble Guide 23 7 Wiring Diagram 29 7 1 Indoor Unit 29 7 2 Outdoor Unit 30 8 Operation Characteristics 32 9 Electronic function 33 9 1 Abbreviation 33 9 2 Display function 33 9 3 Main Protection 34 9 4 Operation Modes and Fu...

Page 3: ...ry be especially careful of the case edges and the fins on the condenser and evaporator For installation always contact the dealer or an authorized service center Do not install the product on a defective installation stand Be sure the installation area does not deteriorate with age If the base collapses the air conditioner could fall with it causing property damage product failure and personal in...

Page 4: ... the drain hose to ensure that water is drained away properly A bad connection may cause water leakage Keep level even when installing the product It can avoid vibration of water leakage Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods It may cause a problem for your neighbors Use two or more people to lift and transport the product Do not ...

Page 5: ...e remote control with new ones of the same type Do not mix old and new batteries or different types of batteries There is risk of fire or explosion Do not recharge or disassemble the batteries Do not dispose of batteries in a fire They may burn of explode If the liquid from the batteries gets onto your skin or clothes wash it well with clean water Do not use the remote of the batteries have leaked...

Page 6: ...1 QRD0GW MOB31 12HFN1 QRD0GW 12k MSAEBU 12HRFNX QRD0GW MOB31 12HFN1 QRD0GW 12k MSAEBU 12HRFN1 QRD0GW B MOB32 12HFN1 QRD0GW 18k MSAECU 18HRFN1 QRD0GW MOB31 18HFN1 QRD0GW 18k MSAECU 18HRFN1 QRD0GW MOB32 18HFN1 QRD0GW S1 18k MSAECU 18HRFNX QRD0GW MOB32 18HFN1 QRD0GW S1 24k MSAEDU 24HRFN1 QRD0GW MOCA30 24HFN1 QRD0GW 24k MSAEDU 24HRFNX QRD0GW MOCA30 24HFN1 QRD0GW 24K MSAEDU 24HRFN1 QRD0GW B MOCA30 24HF...

Page 7: ...D0GW 717 193 302 MSAEBU 12HRFN1 QRD0GW 805 193 302 MSAEBU 12HRFNX QRD0GW 805 193 302 MSAEBU 12HRFN1 QRD0GW B 805 193 302 MSAECU 18HRFN1 QRD0GW 964 222 325 MSAECU 18HRFNX QRD0GW 964 222 325 MSAEDU 24HRFN1 QRD0GW 1106 232 342 MSAEDU 24HRFNX QRD0GW 1106 232 342 MSAEDU 24HRFN1 QRD0GW B 1106 232 342 ...

Page 8: ...8 For MSAEAU 09HRFN1 QRD0GW MSAEAU 09HRFNX QRD0GW ...

Page 9: ...9 For MSAEBU 12HRFN1 QRD0GW MSAEBU 12HRFN1 QRD0GW B MSAEBU 12HRFNX QRD0GW For MSAECU 18HRFN1 QRD0GW MSAECU 18HRFNX QRD0GW ...

Page 10: ...10 For MSAEDU 24HRFN1 QRD0GW MSAEDU 24HRFN1 QRD0GW B MSAEDU 24HRFNX QRD0GW ...

Page 11: ...11 3 2 Outdoor Unit ...

Page 12: ...12 For MOBA31 09HFN1 QRDOGW 487 W1 70 W2 298 555 300 D H 12 60 93 H1 H2 D1 770 W 779 W3 322 D2 25 B1 90 B2 61 5 A2 12 A1 R 6 286 D3 ...

Page 13: ...13 For MOB31 12HFN1 QRD0GW MOB32 12HFN1 QRD0GW MOB31 18HFN1 QRD0GW MOB32 18HFN1 QRD0GW S1 800 W 514 W1 554 60 85 5 340 12 0 311 815 W3 365 333 D 70 W2 H H1 H2 D1 D2 D3 62 B1 106 B2 20 A1 R20 R6 61 6 A2 ...

Page 14: ...14 For MOCA30 24HFN1 QRD0GW MOCA30 24HFN1 QRC8GW ...

Page 15: ...0GW S1 CHECK VALVE Heating Model only CAPILIARY TUBE LIQUID SIDE GAS SIDE HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER Compressor 2 WAY VALVE 3 WAY VALVE 4 WAY VALVE COOLING HEATING T2 Evaporator temp sensor T1 Room temp sensor T3 Condenser temp sensor Accumulator T5 Discharge temp sensor T4 Ambient temp sensor INDOOR OUTDOOR ...

Page 16: ...R Compressor 2 WAY VALVE 3 WAY VALVE 4 WAY VALVE COOLING HEATING T2B Evaporator temp sensor outlet T1 Room temp sensor T3 Condenser temp sensor T5 Discharge temp sensor T4 Ambient temp sensor INDOOR OUTDOOR T2 Evaporator temp sensor middle Accumulator Electronic expansion valve CAPILIARY TUBE ...

Page 17: ...19 3 4 6500 663kgf cm 6700 683kgf cm 5 2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet Rated current of appliance Nominal cross sectional area mm 3 and 6 0 75 6 and 10 1 10 and 16 1 5 16 and 25 2 5 The cable size and the current of the fuse or switch are determined by the maximum current indicated on the nameplate which located o...

Page 18: ...5 5 10 25 15 MSAEBU 12HRFN1 QRD0GW B MOB32 12HFN1 QRD0GW 3 8 Ф9 52 1 4 Ф6 35 5 10 25 15 MSAECU 18HRFN1 QRD0GW MOB31 18HFN1 QRD0GW 1 2 Ф12 7 1 4 Ф6 35 5 20 30 15 MSAECU 18HRFN1 QRD0GW MOB32 18HFN1 QRD0GW S1 1 2 Ф12 7 1 4 Ф6 35 5 20 30 15 MSAECU 18HRFNX QRD0GW MOB32 18HFN1 QRD0GW S1 1 2 Ф12 7 1 4 Ф6 35 5 20 30 15 MSAEDU 24HRFN1 QRD0GW MOCA30 24HFN1 QRD0GW 5 8 Ф15 9 3 8 Ф9 52 5 25 50 30 MSAEDU 24HRFN...

Page 19: ... 3 Connect the charge hose of handle hi connection to the vacuum pump 4 Fully open the handle Lo of the manifold valve 5 Operate the vacuum pump to evacuate 6 Make evacuation for 30 minutes and check whether the compound meter indicates 0 1Mpa If the meter does not indicate 0 1Mpa after pumping 30 minutes it should be pumped 20 minutes more If the pressure can t achieve 0 1Mpa after pumping 50 min...

Page 20: ...lve Connect the charge hose to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the ...

Page 21: ...valve 5 Operate the vacuum pump to evacuate 6 Make evacuation for 30 minutes and check whether the compound meter indicates 0 1Mpa If the meter does not indicate 0 1Mpa after pumping 30 minutes it should be pumped 20 minutes more If the pressure can t achieve 0 1Mpa after pumping 50 minutes please check if there are some leakage points Fully close the handle Lo valve of the manifold valve and stop...

Page 22: ...ut the charging cylinder onto the electronic scale and record the weight 4 Open the valves Low side on the charge set and charge the system with liquid refrigerant If the system cannot be charge with the specified amount of refrigerant or can be charged with a little at a time approximately 150g each time operating the air conditioner in the cooling cycle however one time is not sufficient wait ap...

Page 23: ... little to loosen the fastener Step2 Pull the filter gently along the horizontal direction Step3 Pull out the filter 6 2 How to Remove the horizontal louver Step1 Open the horizontal louver push the locker towards right to open it Step2 Bend the horizontal louver lightly remove it from the indoor unit ...

Page 24: ...emove the two screws Step2 Open the panel assembly move the slider to fix the panel Step3 Press the locker A and B to lose the indoor from the installation plate Step4 Unfold the supporter of Installation plate then let it to hold the indoor unit helpful to do pipe connection in the back ...

Page 25: ...e panel assembly Step1 Open the screw caps A and B remove the two screws Step2 Open the panel assembly loosen the display board connector Step3 Pull the panel assembly along the direction indicated in right image to remove it ...

Page 26: ...the panel to remove the PCB in order to show clearly inside these pictures are without panel 6 6 How to Remove the Electrical control box Step1 Remove screw A B C pull out the coil temperature sensor D from the sensor holders Step2 pull out the Electrical control box Note It is not necessary to remove the panel to remove the Electrical control box in order to show clearly inside these pictures are...

Page 27: ...5 screws A B C D E remove support part F and G Step3 Open the E box to lose the fan motor and louver motor connectors from the PCB Step4 Press the locker H and I to lose the indoor from the installation plate lift it a little and pull out it along the direction indicated in right image Note It is not necessary to remove the panel to remove the Chassis assembly in order to show clearly inside these...

Page 28: ...e 24K indoor unit is relatively large and heavy it must have two persons to implement the following steps Step1 Remove the Electric control box Step2 Remove the Chassis assembly Step3 Unfold the Pipe clamp board C remove screw A and B Step4 Pull out the evaporator ...

Page 29: ...r Unit MSAEAU 09HRFN1 QRD0GW MSAEAU 09HRFNX QRD0GW MSAEBU 12HRFN1 QRD0GW MSAEBU 12HRFNX QRD0GW MSAEBU 12HRFN1 QRD0GW B MSAECU 18HRFN1 QRD0GW MSAECU 18HRFNX QRD0GW MSAEDU 24HRFN1 QRD0GW MSAEDU 24HRFNX QRD0GW MSAEDU 24HRFN1 QRD0GW B ...

Page 30: ...30 7 2 Outdoor Unit MOBA31 09HFN1 QRD0GW MOB31 12HFN1 QRD0GW MOB32 12HFN1 QRD0GW MOB32 18HFN1 QRD0GW S1 ...

Page 31: ...31 MOB31 18HFN1 QRD0GW MOCA30 24HFN1 QRD0GW MOCA30 24HFN1 QRC8GW ...

Page 32: ...features may come into operation and cause the unit to operate abnormally 2 The room relative humidity should be less than 80 If the air conditioner operates beyond this figure the surface of the air conditioner may attract condensation Please set the vertical air flow louver to its maximum angle vertically to the floor and set HIGH fan mode 3 For units with auxiliary electric heater When outside ...

Page 33: ...Turbo or Silence feature is activated Dispalys for three seconds when Timer OFF is set Dispalys for three seconds when Fresh Swing Turbo or Silence feature is cancelled Dispalys under deforsting operation Dispalys when anti cold air feature is activated under heating mode Dispalys during self clean operation if aplicable Dispalys when freeze protection is turned on if aplicable When ECO function o...

Page 34: ... be active immediately and the indoor fan will open 7s later If the unit runs in heating mode the indoor fan will be also controlled by anti cold wind function 9 3 6 Compressor preheating functions Preheating permitting condition When T4 outdoor ambient temperature 3 C the preheating function will be activated 9 3 7 Sensor protection at open circuit and breaking disconnection When there s only one...

Page 35: ...e compressor will run with low frequency When the current is more than setting value the current protection function will be activated and the compressor will stop 9 4 2 2 Outdoor fan running rules For different outdoor units the fan speeds are different For MSAECU 18HRFN1 QRD0GW MSAEDU 24HRFN1 QRD0GW MSAEDU 24HRFNX QRD0GW MSAEDU 24HRFN1 QRD0GW B models The fan speed is controlled by T4 T 4 A A B ...

Page 36: ... d T 1 T S e 9 4 2 4 Condenser temperature protection For MSAEAU 09HRFN1 QRD0GW MSAEAU 09HRFNX QRD0GW MSAEBU 12HRFN1 QRD0GW MSAEBU 12HRFNX QRD0GW MSAEBU 12HRFN1 QRD0GW B MSAECU 18HRFN1 QRD0GW S1 MSAECU 18HRFNX QRD0GW S1 models T3 Resume Off Decrease Hold Increase For MSAECU 18HRFN1 QRD0GW MSAEDU 24HRFN1 QRD0GW MSAEDU 24HRFNX QRD0GW MSAEDU 24HRFN1 QRD0GW B models T3 Resume Off Decrease Hold When co...

Page 37: ...ion C D B A For MSAECU 18HRFN1 QRD0GW MSAEDU 24HRFN1 QRD0GW MSAEDU 24HRFNX QRD0GW MSAEDU 24HRFN1 QRD0GW B models The fan speed is controlled by T4 T 4 E D C B A A 9 4 3 3 Indoor fan running rules When the compressor is on the indoor fan can be set to high med low auto mute When indoor unit coil temperature is low the anti cold air function will start and indoor fan motor will run at low speed the ...

Page 38: ...MSAEDU 24HRFN1 QRD0GW MSAEDU 24HRFNX QRD0GW MSAEDU 24HRFN1 QRD0GW B models AC will enter the defrosting mode according to the value of temperature of T3 and the value range of temperature change of T3 and also the compressor running time During the defrosting mode the compressor keep running indoor and outdoor motor will stop defrost lamp of the indoor unit will be lighted will be displayed If any...

Page 39: ...erature rises 1 be lower than 30 every one hour 2 hours later the setting temperature stops rising and the indoor fan is fixed at low speed When heating the setting temperature decreases 1 be higher than 17 every one hour 2 hours later the setting temperature stops rising and indoor fan is fixed at low speed Anti cold wind function has the priority 9 4 7 3 Operation time in sleep mode is 7 hours A...

Page 40: ...f room temperature sensor will be still valid 2 When the follow me function is available the PCB will control the unit according to the room temperature from the remote controller and the setting temperature 3 The PCB will take action to the mode change information from remote controller signal but it will not affected by the setting temperature 4 When the unit is running with follow me function i...

Page 41: ...y information Displaying code Meaning T1 T1 Indoor room temperature T2 T2 Indoor coil mid temperature T3 T3 Outdoor coil temperature T4 T4 Outdoor temperature T2B Tb Indoor coil outlet temperature TP TP Compressor discharge temp TH TH IPM modular temperature Targeted Frequency FT Targeted Frequency Actual Frequency Fr Actual Frequency Indoor fan speed IF Indoor fan speed Outdoor fan speed OF Outdo...

Page 42: ... 111 119 c0 c1 c9 120 121 129 d0 d1 d9 130 131 139 E0 E1 E9 140 141 149 F0 F1 F9 150 151 159 Indoor fan speed Outdoor fan speed 0 OFF 1 2 3 4 Low speed Medium speed High speed Turbo For some big capacity motors 14 FF Actual fan speed Display value turns to decimal value and then multiply 10 The unit is RPM For some small capacity motors display value is from 14 FF hexadecimal the corresponding fan...

Page 43: ...he switches F2 should be settled as below Dip switch 2 Dip switch 1 Remote on off control status OFF OFF Disconnected send CP closed cancel CP ON OFF Closed send CP disconnected cancel CP 9 5 3 ON OFF control 9 5 3 1 With on off command you can directly use this function regardless remote controller The indoor will be turned on and off by this port But indoor will still get order from remote contr...

Page 44: ...be connect to Max 16 indoor units All the indoor units must be the same series and in the same network The address of Multi function board must be set differently The connection method must be Bus type 9 5 2 The setting state are the same for all the indoor units connected to the same Non polar wired controller 9 5 6 Alarm port output 9 5 6 1 When the Air condition in off state the output signal i...

Page 45: ...45 9 5 7 2 Connected to Non poplar wired controller Note It must use shield cables to connect with Non poplar wired controller The length should not exceed 50m ...

Page 46: ... electricity power in capacitor Electrolytic Capacitors HIGH VOLTAGE CAUTION For other models please connect discharge resistance approx 100Ω 40W or soldering iron plug between terminals of the electrolytic capacitor on the contrary side of the outdoor PCB Note The picture above is only for reference The plug of your side may be different ...

Page 47: ...EC Refrigerant leakage detection 1 times O F0 Overload current protection 2 times O F1 Outdoor ambient temperature sensor T4 open circuit or short circuit 3 times O F2 Condenser coil temperature sensor T3 open circuit or short circuit 4 times O F3 Compressor discharge temperature sensor T5 open circuit or short circuit 5 times O F4 Outdoor unit EEPROM parameter error 6 times O F5 Outdoor fan speed...

Page 48: ...ve feedback from EEPROM chip Supposed causes Installation mistake PCB faulty Trouble shooting EEPROM a read only memory whose contents can be erased and reprogrammed using a pulsed voltage For the location of EEPROM chip please refer to the below photos Note The two photos above are only for reference it s may be not same totally with the ones on your side Indoor PCB Outdoor PCB ...

Page 49: ...olution E1 Error Code E1 Malfunction decision conditions Indoor unit does not receive the feedback from outdoor unit during 110 seconds and this condition happens four times continuously Supposed causes Wiring mistake Indoor or outdoor PCB faulty Trouble shooting ...

Page 50: ...ark Use a multi meter 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 malfunction and need to be replaced ...

Page 51: ...on E3 F5 Error Code E3 F5 Malfunction decision conditions When indoor fan speed keeps too low 300RPM for certain time the unit will stop and the LED will display the failure Supposed causes Wiring mistake Fan ass y faulty Fan motor faulty PCB faulty Trouble shooting ...

Page 52: ... 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 2 Outdoor DC Fan Motor control chip is in outdoor PCB Power on and check if the fan can run normally if the fan can run normally the PCB must has problems and need to be replaced If the fan can t run normally measure the resistance of each two pins If the resistance is not eq...

Page 53: ...Tcool In the beginning 8 minutes after the compressor starts up if T2 Tcool 2 does not keep continuous 4 seconds and compressor running frequency higher than 50Hz does not keep continuous 3 minutes and this situation happens 3 times the display area will show EC and AC will turn off Supposed causes T2 sensor faulty Indoor PCB faulty System problems such as leakage or blocking Trouble shooting ...

Page 54: ...nsor diagnosis and solution E5 Error Code E4 E5 F1 F2 F3 Malfunction decision conditions If the sampling voltage is lower than 0 06V or higher than 4 94V the LED will display the failure Supposed causes Wiring mistake Sensor faulty PCB faulty Trouble shooting ...

Page 55: ...d solution F0 Error Code F0 Malfunction decision conditions An abnormal current rise is detected by checking the specified current detection circuit Supposed causes Power supply problems System blockage PCB faulty Wiring mistake Compressor malfunction ...

Page 56: ...r Code P0 Malfunction decision conditions When the voltage signal that IPM send to compressor drive chip is abnormal the display LED will show P0 and AC will turn off Supposed causes Wiring mistake IPM malfunction Outdoor fan ass y faulty Compressor malfunction Outdoor PCB faulty Trouble shooting ...

Page 57: ...ytic capacitors discharge completely and dismount the IPM Use a digital tester to measure the resistance between 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 ...

Page 58: ... connections and wires are good Disconnect the unit with power supply and try to restart the unit when power supply gets normal No Yes No Correct the connections or replace the wires Yes Power on and when the unit is in standby check if the voltage between P and N is around DC 310V or 340V or 380V For different kinds of units the voltage differs Consult with technical engineer to get definite valu...

Page 59: ...IPM module diagnosis and solution P2 Error Code P2 Malfunction decision conditions If the temperature of IPM module is higher than limited value the LED will display the failure Supposed causes IPM radiator problem PCB faulty Trouble shooting ...

Page 60: ...abnormal inverter compressor drive is detected by a special detection circuit including communication signal detection voltage detection compressor rotation speed signal detection and so on Supposed causes Wiring mistake IPM malfunction Outdoor fan ass y faulty Compressor malfunction Outdoor PCB faulty Trouble shooting ...

Page 61: ...Display board communication error E7 Error Code E7 Malfunction decision conditions Indoor PCB does not receive feedback from Display board Supposed causes Wiring mistake PCB faulty Display board malfunction Trouble shooting ...

Page 62: ... the resistance value with a tester Temperature Sensors Room temperature T1 sensor Indoor coil temperature T2 sensor Outdoor coil temperature T3 sensor Outdoor ambient temperature T4 sensor Compressor discharge temperature TP sensor Measure the resistance value of each winding by using the multi meter ...

Page 63: ... 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 3873...

Page 64: ... 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 86 83 181 6 228 123 253...

Page 65: ...ing Measure the resistance value of each winding by using the tester Position Resistance Value ASN98D22UFZ ASM135D23UFZ ASN140D21UFZ ATF235D22UMT Blue Red 1 57Ω 20 68 1 75Ω 20 68 1 28Ω 20 68 0 75Ω 20 68 Blue Black Red Blue ...

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Midea MOB31-12HFN1-QRD0GW, Service Manual

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