Mitsubishi Electronics MUZ-FD09NA- U1, MUZ-FD12NA- U1 service manual Operational procedure

2. Flow chart of the detailed outdoor unit failure mode recall function

Operational procedure

The outdoor unit might be abnormal.

Confirm if outdoor unit is abnormal according to the following procedures.

Confirm that the remote controller is in the failure mode recall function.

With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 77˚F (25˚C). 1

1. Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received.

Does POWER lamp on the indoor unit blink at the
interval of 0.5 seconds?
Blinks: The outdoor unit is abnormal. Beep is emitted		No
at the same timing as the blinking of POWER
		(OFF)
lamp. 2
	Yes
	(Blinks)

The outdoor unit is abnormal.

Check the blinking pattern, and confirm the abnormal point with the out- door unit failure mode table (10-2.3.).

Make sure to check at least two consecutive blinking cycles. 2

The outdoor unit is normal.

Releasing the failure mode recall function

Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again.

Press RESET button of the remote controller.

Release the failure mode recall function accord- ing to the left mentioned procedure.

Repair the defective parts.

Deleting the memorized abnormal condition

After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" (10-2.1.).

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.

Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. Release the failure mode recall function according to "Releasing the failure mode recall function" men- tioned above.

NOTE: 1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.

2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

2.Blinking pattern when outdoor unit is abnormal:			Blinking at 0.5-				Blinking at 0.5-
	2.5-second OFF	3-second ON	second interval		2.5-second OFF	3-second ON	second interval
ON
OFF
		No beep		Beeps		No beep		Beeps
		Repeated cycle				Repeated cycle			Repeated cycle

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