Mitsubishi KXZ Series - Page 224

-
222
-
'20 • KX-T-373
Error code
Remote control:
7-segment display:
LED Green Red
Indoor
Outdoor
Content
None
Earth leakage breaker activated
Stays Off Stays Off
Stays Off Stays Off
1. Applicable model
5. Troubleshooting
All models
Diagnosis Countermeasure
NO
NO
Is insulation
of respective harnesses OK?
YES
Check of the outdoor unit grounding wire and earth leakage breaker
① 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.)
② In order to prevent malfunction of the earth leakage breaker
itself, confirm the conformity of high harmonic regulation.
* Insulation resistance of compressor
• Immediately after installation or when the unit has been left
for long period without power source, the insulation
resistance may drop to a few MΩ because of refrigerant
migrated in the compressor.
When the earth leakage breaker is activated at lower insulation
resistance, check the following points.
① 6 hours after power ON, check if the insu
lation resistance
recovers to normal.
When power ON, crankcase heater heat up compressor and
evaporates the refrigerant migrated in the compressor.
② Check if the earth leakage breaker is conformed to higher
harmonic regulation or not.
Since the unit has inverter, it is necessary to use components
conformed to high harmonic regulation in order to prevent
malfunction of earth leakage breaker.
YES
Check the outdoor unit grounding
wire and earth leakage breaker
Is any hamess bitten
between pannel and casing
or etc.?
NO
YES
Is the checked
result of insulation resistance
and resistance between terminals
of compressor motor
OK?
Replace compressor. *
Secure insulation
resistance.
Secure insulation
resistance.
2. Error detection method
3
. Condition of error displayed
4. Presumable cause
• Compressor anomaly
• Noise
Note:
Model
typ Resistance (Ω)
at 20°C
FDC90-155KXZEN1-W 0.448
FDC112-155KXZES1-W 1.56