Inverter And Fan Motor Anomaly - Mitsubishi Heavy Industries FDTC50ZHXV Technical Manual

Error code
Remote controller: E51
1. Applicable model
Model FDC71 – 250
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
• Defective outdoor fan motor
• Defective inverter (control)
PCB
Note:
LED Green Red
Keeps flashing Stays Off
Indoor
Keeps flashing 1 time flash
Outdoor
5. Troubleshooting
Diagnosis
• Model FDC 71 – 140
Is DC15V
detected between the connector
CNI4 �-� (CNI2 �-�) on the
inverter PCB?
NO
Is DC15V
detected between the
hanesses at the control PCB side after
disconnecting the connector
(CNI3 or 1)?
NO
Is DC15V
detected on the fan motor
connector?
NO
• Model FDC 200, 250
Replace immediately the inverter PCB and the power transistor.
315
–
Content

Inverter and fan motor anomaly

(Model FDC71 - 250)
YES
Figures in ( ) are for 3-phase models.
YES
YES
–
Countermeasure
Replace inverter PCB.
Broken harness wire
Replace fan motor.
Replace control PCB.