Earth Leakage Breaker Activated - Mitsubishi Heavy Industries SRK20ZSX-W Service Manual

Error code
Remote control: None
1. Applicable model
All models
2. Error detection method
3. Condition of error displayed
4. Presumable cause
• Defective compressor
• Noise
Note:
LED Green Red
Indoor Stays OFF Stays OFF
–
Outdoor Stays OFF
5. Troubleshooting
Diagnosis
Are OK
the insulation
resistance and resistance
between terminals (1) of
compressor?
(1) See page 145.
YES
Is insulation
of respective harnesses OK?
Is any harness bitten between
pannel and casing
or etc?
YES
Check the outdoor unit grounding
wire/earth leakage breaker.
Check of the outdoor unit grounding wire/earth leakage breaker
Run an independent grounding wire from the grounding screw
of outdoor unit to the grounding terminal on the distribution
panel. (Do not connect to another grounding wire.)
In order to prevent malfunction of the earth leakage breaker
itself, confirm that it is conformed to higher harmonic
regulation.
*
Insulation resistance of compressor
• Immediately after installation or when the unit has been left
for long time without power source, the insulation resistance
may drop to a few MΩ because of refrigerant migrated in
the compressor.
When the earth breaker is activated at lower insulation
resistance, check the following points.
When power ON, crankcase heater heat up compressor and
evaporate the refrigerant migrated in the compressor.
Check if the earth leakage breaker is conformed to higher
harmonic regulation or not.
Since the unit is equipped with inverter, it is necessary to use
components conformed to higher harmonic regulation in order
to prevent malfunction of earth leakage breaker.
114
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Content

Earth leakage breaker activated

NO
NO
-
'19 • SCM-SM-276
Countermeasure
*
Replace compressor.
Secure insulation
resistance.