Mitsubishi FDT71VH - Page 124

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123
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'20 • PAC-SM-351
Error code
Remote control:
LED Green Red
Outdoor control PCB
Outdoor inverter
PCB
1-time flashKeeps flashing
Indoor control PCB
Stays OFFKeeps flashing
Content
6-time flash
Yellow LED
E51
1. Applicable model
5. Troubleshooting
Diagnosis Countermeasure
NO
Is DC15V
detected between ② and ③
on CNI3?
Is DC15V
detected after disconnecting
outdoor fan motor?
YES
YES
NO
•
Models FDC100-140VNX-W
•
Models FDC100-140VSX-W
Replace immediately the inverter PCB and the power transistor.
Note(1) Under anomalous conditions,
the voltage becomes less than
DC14V.
Note(2) How to check the voltage between ② and ③ of CNI3
⑴⑵
⑴
Replace inverter PCB.
If not solved, replace noise
lter PCB as well.
Replace outdoor fan motor.
Replace outdoor unit
control PCB.
If not solved, replace
inverter PCB as well.
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:
Inverter and fan motor anomaly
③
②：DC15V(＋)
③：GND(−)
②