Mitsubishi Electric MUZ-FA25VA-E1 Service Manual page 28

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 25:. W1
Does POWER lamp on the indoor
unit blink at the interval of 0.5 seconds?
Blinks: The outdoor unit is abnormal.
Beep is emitted at the same
timing as the blinking of POWER lamp. W2
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the
outdoor unit failure mode table (11-2.3.).
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.
Deleting the memorized abnormal condition
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 outdoor unit is abnormal:
2.5-second OFF
ON
OFF
Yes
(Blinks)
Repair the defective parts.
Blinking at 0.5-
3-second ON
second interval
No beep
Beeps
Repeated cycle
W1. Regardless of normal or abnormal condition, 2 short
beeps are emitted as the signal is received.
No
(OFF)
Release the failure mode recall function according
to the left mentioned procedure.
2.5-second OFF 3-second ON
No beep
Repeated cycle
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The outdoor unit is normal.
Blinking at 0.5-
second interval
Beeps
Repeated cycle