Mitsubishi Electric MUZ-GL09NA Service Manual page 43

Operational procedure
The outdoor unit might be abnormal.
Check if outdoor unit is abnormal according to the following procedures.
Make sure that the remote controller is set to the failure mode recall function.
With the remote controller headed towards the indoor unit, press TOO
COOL button to adjust the set temperature to 77°F (25°C). 1
Does the upper lamp of the OPERATION INDICATOR
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 the upper lamp
of the OPERATION INDICATOR lamp.
The outdoor unit is abnormal.
Check the blinking pattern, and identify the abnormal point by referring to
the outdoor unit failure recall mode table (10-2.3.).
Make sure to check at least 2 consecutive blinking cycles. 2
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
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall
function" (10-2.1.).
Press STOP/OPERATE (OFF/ON) 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 after it is 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:
2.5-second OFF 3-second ON
ON
OFF
Repeated cycle
OBH733G
2
Yes
(Blinks )
Repair the failure parts.
Blinking at 0.5-
second interval
No beep
Beeps
1. Regardless of normal or abnormal condition, 2 short
beeps are emitted as the signal is received.
No
(OFF)
The outdoor unit is normal.
Release the failure mode recall function accord-
ing to the left mentioned procedure.
2.5-second OFF 3-second ON
No beep
Repeated cycle
43
Blinking at 0.5-
second interval
Beeps
Repeated cycle