Mitsubishi MUY-A15NA, Service Manual

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2. Flow chart of the detailed outdoor unit failure mode recall function
Operational procedure
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.
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2.Blinking pattern when outdoor unit is abnormal:
Yes
(Blinks)
No
(OFF)
ON
OFF
No beep
Beeps
Repeated cycle
2.5-second OFF 3-second ON
Blinking at 0.5-
second interval
No beep Beeps
Repeated cycle
2.5-second OFF 3-second ON
Blinking at 0.5-
second interval
Repeated cycle
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1. Regardless of normal or abnormal, 2 short
beeps are emitted as the signal is received.
Does left lamp of OPERATION INDICATOR lamp
on the indoor unit blink at the interval of 0.5 seconds?
Blinks: The outdoor unit is abnormal.
Beep are emitted at the same
timing as the blinking of the left lamp of
OPERATION INDICATOR lamp.
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2
Deleting the abnormal memorized condition
1
After repairing the unit, recall the failure mode again according to
"Setting up the failure mode recall function" mentioned above.
2
Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
3
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
4
Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
Repair the defective parts.
With the remote controller headed towards the indoor unit, press TOO COOL or TOO
WARM button to adjust the set temperature to 77ºF
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1
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.
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the
outdoor unit failure mode table (Refer to 10-2.3.).
Make sure to check at least two consecutive blinking cycles.
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2
Release the failure mode recall function according
to the left mentioned procedure.
Confirm that the remote controller is in the failure mode recall
function.
The outdoor unit might be abnormal.
Confirm if outdoor unit is abnormal according to the following procedures.
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