Mitsubishi Heavy Industries FDT71VNXVD Service Manual page 79

Error code
Indoor control PCB
Remote controller: E42
Outdoor control PCB
Outdoor
inverter
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:
LED Green
Keeps flashing
Keeps flashing
Yellow LED
Stays off or 4 times flash
PCB
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?
(1) 1.154 or more at 20°C (Model FDC71VNX)
YES
Continues to next page.
Red
Content
Stays OFF
1 time flash
Current cut (1/2)
Diagnosis
NO
NO
NO
NO
0.293 or more at 20°C (Models FDC100∼140VNX)
1.172 or more at 20°C (Models FDC100∼140VSX)
79
89
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'10 • PAC-SM-137A
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.