Mitsubishi Electric FDT125VNVF Technical Manual page 442

Indoor display
Error code
E42
Remote controller:
inverter PCB
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:
RUN light
ON
Green LED
Outdoor
control PCB
Keeps flashing
Yellow LED
Outdoor
1 time flash
5. Troubleshooting
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?
YES
To next page.
TIMER light
Content
1 time flash
Red LED
Current cut (1/2)
1 time flash
Diagnosis
NO
NO
NO
NO
(1) 0.293Ω or more at 20°C (Single phase models)
1.172Ω or more at 20°C (3-phase models)
441
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'12 • PAC-T-174
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.