Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 226

Error code
Indoor control PCB
Remote control:
E42
Outdoor control PCB
Outdoor inverter
Note (1) 9-time flash is for the FDC250 model only.
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 minutes after the intial
detection. (FDC71-250 only)
4. Presumable cause
• The service valves closed
• Faulty power source
• Insufficient refrigerant amount
• Faulty compressor
• Faulty power transistor
module
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
1-time flash or 9-time flash
5. Troubleshooting
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?
YES
To next page.
Red
Content
Stays OFF
1-time flash
Current cut (1/2)
(1)
Diagnosis
NO
NO
NO
NO
(1) 0.864Ω or more at 20°C (Model SRC40-60ZSX-S)
1.154Ω or more at 20°C (Model FDC71VNX)
0.293Ω or more at 20°C (Models FDC100-140VNX)
1.172Ω or more at 20°C (Models FDC100-140VSX)
0.448Ω or more at 20°C (Models FDC100-140VNA)
1.044Ω or more at 20°C (Models FDC100-140VSA)
1.172Ω or more at 20°C (Model FDC200VSA)
0.309Ω or more at 20°C (Model FDC250VSA)
225
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'19 • PAC-T-327
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.