Mitsubishi Electronics MSZ-A17NA, MSY-A24NA Check of remote controller and receiver P.C. board

Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not 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-	No
troller visible?

(not clear)

Yes

Replace the batteries. (Refer to 8-1.4.)

Remove the batteries, then set them back and press RESET button. (Refer to 8-1.4.) Check if the unit operates with the remote controller.

Does the unit operate with the	No
remote controller?
Yes
OK

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 3.28ft.?
	No
MSZ-A24NA	MSZ-A09/12/15/17NA
MSY-A24NA	MSY-A15/17NA

Measure the voltage between receiver P.C. board connector CN301 No.2(+) and No.3(-) when the remote controller button is pressed.

●Reinstall the unit away from lights.

●Attach a filter on receiving part.

Yes

Is the voltage approx. 4V DC?

No (5V or 0V DC)

Replace the indoor electronic control P.C. board.

Replace the receiver P.C. board.

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