Mitsubishi FDT100VNXWVH Service Manual page 124

Error code
Indoor control PCB
Remote control:
E51
Outdoor control PCB
Outdoor inverter
1. Applicable model
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 FDC100-140VNX-W
•
detected between ② and ③
detected after disconnecting
outdoor fan motor?
Models FDC100-140VSX-W
•
Replace immediately the inverter PCB and the power transistor.
Note(2) How to check the voltage between ② and ③ of CNI3
Red
Content
Stays OFF
1-time flash
Inverter and fan motor anomaly
Diagnosis
⑴ ⑵
Is DC15V
on CNI3?
Note(1) Under anomalous conditions,
the voltage becomes less than
NO
DC14V.
⑴
Is DC15V
123
- -
'20 • PAC-SM-351
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