Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 238

Error code
Indoor control PCB
Remote control:
E51
Outdoor control PCB
Outdoor inverter
1. Applicable model
Models FDC71-140
2. Error detection method
When power transistor anomaly
is detected for 15 minutes
continuously
3. Condition of error displayed
Same as above
4. Presumable cause
• Outdoor fan motor anomaly
• Inverter PCB anomaly
• Outdoor unit control (or main)
PCB anomaly
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
6-time flash
5. Troubleshooting
• Models FDC71-140VNX
detected between ② and ③
detected after disconnecting
outdoor fan motor?
• Models FDC100-140VSX
Replace immediately the inverter PCB and the power transistor.
Note(2) How to check the voltage between ② and ③ of CNI3?
·
Models FDC100-140VNA/VSA
Replace immediately the main PCB.
Red
Content
Stays OFF
Inverter and fan motor anomaly
1-time flash
(Models FDC71-140 only)
Diagnosis
⑴ ⑵
Is DC15V
on CNI3?
Note(1) Under anomalous conditions,
the voltage becomes less than
NO
DC14V.
⑴
Is DC15V
237
- -
'19 • PAC-T-327
Countermeasure
Replace inverter PCB.
YES
If not solved, replace noise
filter PCB as well.
Replace outdoor fan motor.
YES
NO Replace outdoor unit
control PCB.
If not solved, replace
inverter PCB as well.
② ： DC15V (＋)
③ ： GND (−)
③
②