Mitsubishi Heavy Industries FDT90VNPWVH Service Manual page 101

Error code
Remote control: 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.
4. Presumable cause
• The valves closed
• Faulty power source
• Insufficient refrigerant amount
• Faulty compressor
• Faulty power transistor
module
Note:
LED Green Red
Indoor Keeps flashing Stays OFF
5. Troubleshooting
Diagnosis
Is the
power source
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
resistance between terminals (1)
of compressor motor
OK?
(1) 0.724Ω or more at 20°C (Model FDC90, 100)
YES
To next page.
100
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Content
Current cut (1/2)
NO
NO
NO
NO
-
'19 • PAC-SM-334
Countermeasure
Check power source.
Open the service 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.