8-5. Troubleshooting flow

When left OPERATION INDICATOR lamp flashes 3-time. Indoor fan motor doesn’t operate.

A Check of indoor fan motor

Turn OFF the power supply. Check connector CN211 visually.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

Yes

 

Is soldering point of the connector

No

 

 

 

 

Are lead wires connected?

 

 

 

 

 

 

 

 

 

correctly soldered?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reconnect the lead wires.

 

 

 

 

 

 

 

 

 

Resolder it.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Disconnect lead wires from connector CN211 on the indoor electronic control P.C. board.

Measure resistance between lead wires: No.1 and No.5 and then No.3 and No.5.

Is resistance 0 (short circuit) or ∞ (open circuit)?

Yes ( 0 or ∞)

Repair the indoor fan motor.

No

(others)

No

Insert screwdriver into air outlet to rotate indoor fan motor slowly for 1 revolution or over, and measure voltage No.2(+) and No.3(-) on CN121.

Does voltage repeat 0V DC and 5V DC?

Yes

Replace the indoor electronic control P.C. board.

Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn’t operate with the remote controller.

B Check of remote controller and receiver P.C. board

wCheck if the remote controller is exclusive for this air conditioner.

Switch on the remote controller.

Is LCD display on the remote con- troller visible?

Yes

Remove batteries, then set them back and press the RESET button.

Check if the unit operates with remote controller.

Does the unit operate with remote controller?

Yes

OK

No

 

Replace the batteries.

(not clear)

(Refer to 8-1.4.)

 

No

 

 

 

 

 

Turn on a radio to AM and press switch on

 

 

 

 

 

 

the remote controller.

No

 

 

 

 

 

 

Is noise heard from radio?

 

 

 

 

 

 

Yes

 

 

 

 

 

Replace the remote controller.

Are there any fluorescent lights of

Yes

inverter or rapid-start type within the

 

range of 1m?

 

 

No

 

 

 

 

 

 

 

 

●Reinstall the unit away from lights.

●Attach a filter on receiving part.

Measure the voltage between receiver P.C. board connector CN302 No.3(-)and No.5(+) when the remote controller button is pressed.

Is the voltage approx. 4V DC?

Yes

 

 

No(5V or 0V DC)

 

 

 

 

 

Replace the power monitor, receiver P.C.board.

Replace the indoor electronic control P.C. board

15

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Mitsubishi Electronics MS-GD08ND-ci service manual Check of indoor fan motor, Troubleshooting flow
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MS-GD08ND-ci specifications

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