Mitsubishi Heavy Industries FDC112KXEN6 Technical Manual page 357

Error code
Remote controller: E42
7-segment display: E42
1. Applicable model
FDC112-155KXEN6
FDC112-155KXES6
2. Error detection method
In order to prevent from
overcurrent of inverter,
if the current exceeds the
specifications, it makes the
compressor stopping.
3. Condition of error displayed
If the output current of inveter
exceeds the specifications, it
makes the compressor stopping.
After 3-minute delay, the
compressor restarts, but if
this amonaly occurs 4 times
within 30 minute after the intial
detection.
4. Presumable cause
• Open the valves
• Faulty power supply
• Insufficient refrigerant
amount
• Faulty compressor
• Faulty power transistor
module
Note:
LED Green Red
Keeps flashing Stays Off
Indoor
Keeps flashing 1 time flash
Outdoor
5. Troubleshooting
Diagnosis
Continue from previous page
Is the
checked result of
power transistor
module OK?
YES
• Is the installation space 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 operation valves fully opened?
Is the filter clogged?
• At heating, does the indoor fan motor run?
Are the operation 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 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.
353
–
Content
Current cut (2)
NO
NO
–
Countermeasure
Replace inverter PCB
Replace inverter PCB