Mitsubishi Electronics PKA-A30KA4.TH DC Fan motor fan motor/indoor controller circuit board

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9-6-2. DC Fan motor (fan motor/indoor controller circuit board)

Check method of DC fan motor (fan motor/indoor controller circuit board)

Notes

·High voltage is applied to the connecter (CNMF) for the fan motor. Pay attention to the service.

·Do not pull out the connector (CNMF) for the motor with the power supply on. (It causes trouble of the indoor controller circuit board and fan motor.)

Self check

Symptom : The indoor fan cannot rotate.

Wiring contact check

Contact of fan motor connector (CNMF)

Is there contact failure?

Yes

Wiring recovery

No

Power supply check (Remove the connector (CNMF))

Measure the voltage in the indoor controller circuit board.

TEST POINT : VDC (between 1 (+) and 3 (-) of the fan connector): VDC DC294~325V

TEST POINT : VCC (between 4 (+) and 3 (-) of the fan connector): VCC DC15V

Is the voltage normal?

No

Yes

Sensor signal check

Measure the voltage between CNMF  and DC 0V and DC 15V in the indoor controller circuit board.

Indoor controller board fuse check

Is the fuse normal?

 

No

Replace

 

 

 

 

the fuse.

Yes

 

 

 

 

OK

Replace the indoor

NG

 

Check the operation

controller board.

 

 

 

 

 

 

OK

 

Check the operation

 

END

 

NG

Replace the fan motor.

END

Does the voltage repeat

No

 

DC 0V and DC 15V?

 

Yes

 

Replace the indoor

 

controller board.

 

 

OK

Check the operation

END

NG

 

Replace the fan motor.

 

Replace the fan motor.

YesOK

Check the operation of fan.

END

NG

Replace the indoor controller board.

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Contents Parts Catalog OCB488 ContentsRevised EDITION-A Reference Manual Remote controller Optional partsAlways Observe for Safety Safety PrecautionFront grille When charging directly from cylinderPart Names and Functions Operation Section Display SectionTimer display Operation Mode displayMode Select button Temperature setting displayService Ref SpecificationsPKA-A24KAL PKA-A30KAL Noise Criterion CurvesPKA-A24KA4.TH PKA-A30KA4.THUnit inch mm Outlines and DimensionsPKA-A24KA4.TH PKA-A30KA4.TH PKA-A36KA4.TH Explanation of symbols Wiring DiagramHeat exchanger Refrigerant System DiagramAccording to 9-4. Troubleshooting by inferior phenomena TroubleshootingTroubleshooting Case of trouble during operation MALFUNCTION-DIAGNOSIS Method by Remote ControllerProcedure Wired remote controllerU9,UH Remote controller wire short Wired remote controller LED 1, 2 PCB in outdoor unitUnit’s power terminal block L1, L2, GR Appear even when operationSELF-DIAGNOSIS Action Table Operating Pipe temperatureCondenser-Evaporator TH5 Cause Countermeasure Pipe temperature thermistorRemote controller transmission ErrorE0/signal receiving errorE4Indoor/outdoor unit communication Error Signal receiving errorError Transmitting error Remote controller control boardController Troubleshooting by Inferior PhenomenaPhenomena Cause Countermeasure 1Upward/downward vane Performance failureCooling Only type When the remote controller cannot be usedEmergency Operation Heat pump typeThermistor TH5 Lower temperatureCondenser/evaporator temperature ThermistorDC Fan motor fan motor/indoor controller circuit board Sensor signal checkTest Point Diagram Functions of DIP Switch and Jumper Wire System constraint Special FunctionOperation Rotation function and Back-up function Outline of functions2nd unit Cut-out Request Code ListRotation setting 2nd stage cut-in settingOutline of functions How to connectSetting method of each function by wired remote controller BACK-UP Heating Function CN152Photo Disassembly ProcedureOperation Procedure Photos & Illustrations Be careful when removing heavy partsVane Motor and Drain Hose Operation Procedure PhotosRemoving the Nozzle Assembly with Vane Remove the liquid pipe thermistor and cond / eva thermistor Disconnect the connector CN44 on the indoor controllerRemove the panel and the corner box. Refer to step Remove the screw fixing motor band. See PhotoDisconnect the connector CN20 on the indoor controller Board Remove the room temperature thermistor

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