Midea MBSFI-A1-1511 Service Manual Download Page 28 | Manualshive

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8. Troubleshooting

Safety

Electricity power is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electricity

power in capacitor.

Electrolytic Capacitors

(HIGH VOLTAGE! CAUTION!)

For other models, please connect discharge resistance (approx.100

Ω 40W) or soldering iron (plug) b, -

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.

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Summary of Contents for MBSFI-A1-1511

Page 1: ...Mission 3D Inverter Series Service Manual 2014 MBSEU A 1412...

Page 2: ...tion 15 5 4 Installation for the first time 16 5 5 Adding the refrigerant after running the system for many years 17 5 6 Re installation while the indoor unit need to be repaired 18 5 7 Re installatio...

Page 3: ...reful 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 s...

Page 4: ...way 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...

Page 5: ...f 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 T...

Page 6: ...or Units 3D inverter Capacity Indoor units Outdoor units 9k MSMBAU 09HRFN1 QRD0GW MOB01 09HFN1 QRD0GW 12k MSMBBU 12HRFN1 QRD0GW MOB01 12HFN1 QRD0GW 18k MSMBCU 18HRFN1 QRD0GW MOB01 18HFN1 QRD0GW 24k MS...

Page 7: ...3 Dimension 3 1 Indoor Unit Model W D H MSMBAU 09HRFN1 QRD0GW 730 198 293 MSMBBU 12HRFN1 QRD0GW 810 200 300 MSMBCU 18HRFN1 QRD0GW 980 225 325 MSMBDU 24HRFN1 QRD0GW 1090 235 338...

Page 8: ...For MSMBAU 09HRFN1 QRD0GW For MSMBBU 12HRFN1 QRD0GW For MSMBCU 18HRFN1 QRD0GW For MSMBDU 24HRFN1 QRD0GW...

Page 9: ......

Page 10: ...3 2 Outdoor Unit More than 30cm More than 60cm More than 200cm More than 30cm More than 60cm Service space Fence or obstacles...

Page 11: ...For MOB01 09HFN1 QRD0GW MOB01 12HFN1 QRD0GW MOB01 18HFN1 QRD0GW...

Page 12: ...For MOF2 24HFN1 QRD0GW Model W D H W1 A B MOF2 24HFN1 QRD0GW 845 320 700 908 560 335...

Page 13: ...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 ACCUMULATOR INDOOR OUTDOOR CHECK...

Page 14: ...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 sectiona...

Page 15: ...RD0GW MOB01 09HFN1 QRD0GW 3 8 9 52 1 4 6 35 5 10 25 15 MSMBBU 12HRFN1 QRD0GW MOB01 12HFN1 QRD0GW 3 8 9 52 1 4 6 35 5 10 25 15 MSMBCU 18HRFN1 QRD0GW MOB01 18HFN1 QRD0GW 1 2 12 7 1 4 6 35 5 20 30 15 MSM...

Page 16: ...ction 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 I...

Page 17: ...ensure the 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 refrig...

Page 18: ...o the close position 5 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0 1MPa 6 Set the 3 way valve to the closed position immediately Do this quickly so that the...

Page 19: ...cuum pump 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 o...

Page 20: ...Be sure to check for gas leakage...

Page 21: ...tioner is used beyond the above conditions certain safety protection features may come into operation and cause the unit to operate abnormally 2 The room relative humidity should be less than 80 If th...

Page 22: ...urbo 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 operat...

Page 23: ...working 7 3 6 Indoor fan delayed open function When the unit starts up the louver will be active immediately and the indoor fan will open 7s later If the unit runs in heating mode the indoor fan will...

Page 24: ...tting value the current protection function will be activated and the compressor will stop 7 4 2 2 Outdoor fan running rules The outdoor unit will be run at different fan speed according to T4 T4 A A...

Page 25: ...or will stop 7 4 3 2 Outdoor fan running rules The outdoor unit will be run at different fan speed according to T4 T4 E D C B A A 7 4 3 3 Indoor fan running rules When the compressor is on the indoor...

Page 26: ...of the relevant mode The louver operates same as in relevant mode If the machine switches mode between heating and cooling the compressor will keep stopping for certain time and then choose mode acco...

Page 27: ...r 3 minutes when power returns If the memorization condition is forced cooling mode the unit will run in cooling mode for 30 minutes and turn to auto mode as 24 setting temp If AC is off before power...

Page 28: ...lectricity power in capacitor Electrolytic Capacitors HIGH VOLTAGE CAUTION For other models please connect discharge resistance approx 100 40W or soldering iron plug between terminals of the electroly...

Page 29: ...tection 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 dischar...

Page 30: ...tallation mistake PCB faulty Trouble shooting Yes Replace the indoor outdoor main PCB Power off then restart the unit 2 minutes later EEPROM a read only memory whose contents can be erased and reprogr...

Page 31: ...Yes Power off then restart the unit 2 minutes later Power off then restart the unit 2 minutes later No Replace the outdoor main PCB Power on Is the error extinguished Replace the outdoor main PCB Powe...

Page 32: ...osed causes Wiring mistake Fan ass y faulty Fan motor faulty PCB faulty Trouble shooting Power off then restart the unit 2 minutes later Shut off the power supply Rotate the fan by hand The unit opera...

Page 33: ...trol 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 resis...

Page 34: ...4 seconds 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...

Page 35: ...mpling 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 Check the connection between temperatu...

Page 36: ...ires and connectors Yes No Check the IPM No Yes Replace the IPM board or replace the main PCB Check the outdoor fan and the outdoor unit ventilation No Please refer to the solution of Fan Speed Has Be...

Page 37: ...ecified voltage detection circuit Supposed causes Power supply problems System leakage or block PCB faulty Trouble shooting Check the power supply Check the connections and wires Stop the unit No Yes...

Page 38: ...uble shooting Check the air flow system of indoor and outdoor units Clear up the air inlet and outlet or the heat exchanger of indoor and outdoor units Yes No Yes Yes Power off then restart the unit 1...

Page 39: ...istake IPM malfunction Outdoor fan ass y faulty Compressor malfunction Outdoor PCB faulty Trouble shooting Check the wiring between main PCB and compressor Correct the connection or replace the wires...

Page 40: ...rom PCB measure the resistance value with a tester Temperature Sensors Room temp T1 sensor Indoor coil temp T2 sensor Outdoor coil temp T3 sensor Outdoor ambient temp T4 sensor Compressor discharge te...

Page 41: ...0 40060 3 41 5878 37 5 87359 77 1 29078 117 0 38991 2 39 8239 38 5 62961 78 1 25423 118 0 37956 1 37 1988 39 5 39689 79 1 21330 119 0 36954 0 35 2024 40 5 17519 80 1 17393 120 0 35982 1 33 3269 41 4 9...

Page 42: ...essor checking Measure the resistance value of each winding by using the tester Position Resistance Value ASN98D22UFZ ASM135D23UFZ DA200S2C 10MT Blue Red 1 57 20 68 1 75 20 68 0 51 20 68 Blue Black Re...

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