Mitsubishi Electric MUZ-LN25VG Service Manual page 35

2. Flow chart of the detailed outdoor unit failure mode recall function
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 TEMP
button to adjust the set temperature to 25°C. 1
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. 2
The outdoor unit is abnormal.
Check the blinking pattern, and identify the abnormal point by referring to
the outdoor unit failure recall mode table (12-2.3.).
Make sure to check at least two 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" (12-2.1.).
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
ON
OFF
OBH767
Yes
(Blinks
)
Repair the failure parts.
Blinking at 0.5-
3-second ON second interval
No beep
Beeps
Repeated cycle
1. Regardless of normal or abnormal condition, 2 short
beeps are emitted as the signal is received.
NOTE: It takes up to 1 minute to indicate the outdoor unit
abnormality.
Even if POWER lamp is not lighting, keep check-
ing at least 1 minute or longer.
No
(OFF)
Release the failure mode recall function accord-
ing to the left mentioned procedure.
2.5-second OFF 3-second ON
No beep
Repeated cycle
35
The outdoor unit is normal.
4 The information regarding whether the
connected outdoor unit is a low-standby-
power model or a non-low-standby-power
model will also be initialized.
4
(Default= compatible with a low-standby-
power model)
Blinking at 0.5-
second interval
Beeps
Repeated cycle