Mitsubishi Electronics MSZ-A12NA, MSY-A24NA, MSY-A15NA, MSY-A17NA Failure mode recall function

Repeated cycle

8-2. Failure mode recall function

Outline of the function

This air conditioner can memorize the abnormal condition which has occurred once.

Even though LED indication listed on the troubleshooting check table (8-4.) disappears, the memorized failure details can be recalled.

This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.

1. Flow chart of failure mode recall function for the indoor/outdoor unit

Those figures show about MSZ-A09/12/15/17.

Operational procedure

The cause of abnormality cannot be found because the abnormality doesn't recur.

Setting up the failure mode recall function

Turn ON the power supply.

<Preparation of the remote controller>

1 While pressing both OPERATION SELECT

button and TOO COOL button on the remote controller at the same time, press RESET button.

2 First, release RESET button.

And release the other two buttons after all LCD in operation display section of the remote controller is displayed after 3 seconds.

Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. W1

			W1. Regardless of normal or abnormal condition, a short
Does the left lamp of OPERATION INDICATOR	No		beep is emitted once the signal is received.
lamp on the indoor unit blink at the interval of 0.5		Indoor unit is normal.
seconds?	(OFF)	But the outdoor unit might be abnormal because there are some
Blinks: Either indoor or outdoor unit is abnormal.		abnormalities that can't be recalled with this way.
Beep is emitted at the same timing		Confirm if outdoor unit is abnormal according to the detailed outdoor
as the blinking of the left lamp of		unit failure mode recall function.
OPERATION INDICATOR lamp. W2

Judgment of indoor/outdoor abnormality

Yes

(Blinks)

Before blinking, does the left lamp of

OPERATION INDICATOR lamp stay ON for 3Yes seconds?

Stays ON for 3 seconds (without beep): The outdoor unit is abnormal.

No

The indoor unit is abnormal.

Check the blinking pattern, and confirm the abnormal point with the indoor unit failure mode table(8-2.2.).

Make sure to check at least two consecutive blinking cycles. W2

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.

Repair the defective parts.

Deleting the memorized abnormal condition

The outdoor unit is abnormal.

Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to outdoor unit service manual.) Make sure to check at least two consecutive blinking cycles. W3

1After repairing the unit, recall the failure mode again according to

"Setting up the failure mode recall function" mentioned above.

2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.

3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.

4Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above.

Note1.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.

W2. Blinking pattern when the indoor unit is abnormal:

Blinking at 0.5-	Blinking at 0.5-
2.5-second OFF second interval	2.5-second OFF second interval
ON
OFF
Beeps	Beeps
Repeated cycle	Repeated cycle

Beeps

Repeated cycle

W3.Blinking pattern when the outdoor unit is abnormal:

		Blinking at 0.5-
2.5-second OFF	3-second ON	second interval
ON
OFF
	No beep	Beeps

		Blinking at 0.5-
2.5-second OFF	3-second ON	second interval
	No beep	Beeps
	Repeated cycle

Repeated cycle

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