Mitsubishi Heavy Industries FDTC50ZHXV Technical Manual page 317

Error code
Remote controller: E42
1. Applicable model
All models
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
• The valves closed
• 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
Is the
Power supply
voltage OK?
YES
Are the
service valves
opened?
YES
Is the
high pressure
during operation
OK?
YES
Is the
checked result of
insulation resistance and
coil resistance (1) of
compressor motor
OK?
(1) 0.4Ω or more at 25°C
YES
Continues to next page.
307
–
Content
Current cut (1/2)
NO
NO
NO
NO
–
Countermeasure
Check power supply.
Open the valves.
Check refrigerant amount
and refregerant circuit
* In case of transitional
increase of high pressure
and/or test run, several
times restarting may
recover it, because liquid
refrigerant (migrated)
in the compresser is
discharged from the
compressor.
Replace compressor.