Mitsubishi Heavy Industries FDT Series Technical Manual page 458

Indoor display
Error code
E42
Remote controller:
control PCB
inverter PCB
3.
•
•
• Faulty power supply
Note:
RUN light
ON
Green LED
Outdoor
Keeps flashing
Yellow LED
Outdoor
1 time flash
From previous page
Is the
checked result of power
transistor module
OK?
YES
• Is the space for installation of indoor and/or outdoor unit enough?
• Is there any short circuit of air on indoor and/or outdoor unit?
• At cooling, does the outdoor fan motor run?
Are the service valves fully opened?
Is the filter clogged?
• At heating, does the indoor fan motor run?
Are the service valves fully opened?
Is the filter clogged?
• Is there any liquid flooding?
Is the superheat within normal range?
Is the low pressure sensor and suction pipe temperature
thermistor normal?
• Is there any anoumalous sound on the compressor?
YES
After
resetting power for
several times does it
become normal?
YES
Temporary noise may cause of anomaly.
If noise source can be found, take countermeasure.
TIMER light
Content
1 time flash
Red LED
1 time flash
NO
NO
- 457 -
'12 • PAC-T-173
Replace.
Replace.