Current Cut - Mitsubishi Heavy Industries SRK20ZJX-S Service Manual

Error code
E42
Remote controller:
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 supply
• Insufficient refrigerant amount
• Faulty compressor
• Faulty power transistor
module
Note:
LED Green Red
Keeps flashing Stays OFF
Indoor
– 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) SCM40, 45, 50 : 1.619 or more at 20°C
SCM60, 71, 80 : 1.154 or more at 20°C
YES
Continues to next page.
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Content

Current cut (1/2)

NO
NO
NO
NO
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'10 • SCM-SM-094
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.