Mitsubishi Electronics MSZ-FA35VA, MSZ-FA25VA Check of indoor fan motor, Troubleshooting flow

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9-6. Troubleshooting flow

When POWER lamp flashes 3-time.

Indoor fan does not operate.

A Check of indoor fan motor

The indoor fan motor error has occurred, and the indoor fan doesn't operate.

Turn OFF the power supply.

Insert a stick such as a screw driver into the air outlet, and check if there is any catch in the rotation of the line flow fan.

Is there any foreign matter that interferes the rotation of the line flow fan?

Yes

Adjust the line flow fan and remove the foreign matter.

No

Pay careful attention to the high voltage on the fan motor connector CN211.

w

Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch.

Measure the supply voltage as follows within 12 seconds after EMERGENCY OPERATION switch is pressed.

If more than 12 seconds passes by, turn OFF the power supply and turn ON it again, then measure the voltage.

1.Measure the voltage between CN211 1(+) and 3(-). 2.Measure the voltage between CN211 5(+) and 3(-).

wIf 12 seconds or more passes after EMERGENCY OPERATION switch is pressed, the voltage mentioned above 2 goes 0V DC although the indoor electric control P.C. board is normal.

Is there 311V DC between

 

 

 

CN211 1 (+) and 3 (-), and does

 

 

 

the voltage between CN211 5(+)

Yes

 

and 3(-) rise to the range of 3 to 6V

 

 

Replace the indoor fan motor.

 

DC within 12 seconds after

 

 

 

 

 

 

EMERGENCY OPERATION switch

 

 

 

is pressed?

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

Indoor electronic control P.C. board

CN211

Replace the indoor electronic control P.C. board.

The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops.

Measure the voltage between CN211

 

Is it unchanged holding

Changed

 

 

Replace the indoor electronic control P.C. board.

6(+) and 3(-) while the fan

 

0V DC or 15V DC?

 

 

 

 

motor is rotating.

 

 

 

 

 

 

 

 

 

Unchanged

Replace the indoor fan motor.

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Contents MSZ-FA25VA E1 MSZ-FA35VA E1 ContentsTechnical Changes Generalized stepping motorFront panel opening/closing output gear Part Names and Functions Wash reset switch Open Closed Receiving sectionIndoor Unit MSZ-FA25VA MSZ-FA35VA See control operationRemote Controller MSZ-FA25VA E1 MSZ-FA35VA E1 AccessoriesSpecification Specifications and rating conditions of main electric partsWhen outdoor unit is MXZ type Noise Criteria Curves MSZ-FA25VA E1MSZ-FA35VA E1 MSZ-FA25VA E1 MSZ-FA35VA E1 Outlines and DimensionsIndoor Unit Unit mmRefrigerant System Diagram Wiring DiagramMSZ-FA25VA E1 Indoor Unit MSZ-FA35VA E1 Indoor UnitHow to modify the remote controller P.C. board Service FunctionsRemote controller model KM05A OperationRemote controller Troubleshooting Remove InstallOutdoor Unit MXZ series Information for Multi System AIR ConditionerOFF Failure mode recall functionTo identify the error.Refer to 9-6.For G Plasma Deodorizing Indoor unit failure mode tablePlasma AIR Purifying OFFStart Instruction of troubleshooting· Flashing of Power lamp indicates abnormalities Troubleshooting check tablePlasma AIRPurifying Trouble criterion of main parts Troubleshooting flow When Power lamp flashes 3-time Indoor fan does not operateCheck of indoor fan motor Check of remote controller and receiver P.C. board Indoor electronic control P.C.Board LED How to check mis-wiring and serial signal errorCheck of installation of the horizontal vane Plasma Deodorizing 0V? Safety Deviceplasma UnitAIR Purifying 0V? Continuously flash?Indoor unit and outdoor unit do not operate Check of auto front panelYes Electromagnetic noise enters into TV sets or radiosPower monitor receiver P.C. board Test point diagram and voltagePlasma power P.C. board Indoor electronic control P.C. boardRemoving the panel Photo Disassembly InstructionsRemoving the electrical box Operating Procedure PhotosRemoving the vertical vane motor unit Photo Removing the horizontal vane motor unit PhotoRemoving the indoor fan motor and the line flow Photo FanRemoving the plasma power P.C. board Photo Accessory and Remote Controller Parts ListIndoor Unit Electrical Parts and Functional Parts Safety PlasmaIndoor Unit Heat Exchanger Motor Receiver P.C Board HolderDiagram E02 Symbol Qty/unit Part name Wiring509 504Deodorizing Ceramic Filter Optional PartsPage Specifications subject to change without notice