Mitsubishi Electric MXZ-2C20NA2 Service Manual page 111

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.
*3
With the remote controller headed towards the indoor unit, press the
TEMPERATURE buttons to adjust the set temperature to 77°F (25°C). *1
Does 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
OPERATION INDICATOR lamp. *2
The outdoor unit is abnormal.
Check the blinking pattern, and identify the abnormal point by referring to the
table of outdoor unit failure mode recall function (12-2.3.).
Make sure to check at least 2 consecutive blinking cycles. *2
Release the failure mode recall function. *3
Delete the memorized abnormal condition. *3
Release the failure mode recall function. *3
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
Repeated cycle
OBH702N
Yes
(Blinks
)
Repair the failure parts.
Blinking at 0.5-
3-second ON second interval
No beep
Beeps
*1 Regardless of normal or abnormal condition, 2 short
beeps are emitted as the signal is received.
*3 Refer to the service manual of indoor unit.
No
(OFF)
Release the failure mode recall function. *3
2.5-second OFF 3-second ON
No beep
Repeated cycle
111
The outdoor unit is normal.
Blinking at 0.5-
second interval
Beeps
Repeated cycle