Mitsubishi Heavy Industries FDT71VNXVD Service Manual page 86

Error code
Indoor control PCB
Remote controller:
E51
Outdoor control PCB
Outdoor
inverter
1. Applicable model
All models
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 PCB
• Defective outdoor control
PCB
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED
2 times flash or 6 times flash
PCB
5. Troubleshooting
Is DC15V
detected between the connector
CNI4 - (CNI2 - ) on the
inverter PCB?
Is DC15V
detected between the
hanesses at the control PCB side after
disconnecting the connector
(CNI4 or 2)?
Is DC15V
detected on the fan motor
connector?
Red
Content
Stays OFF
Inverter and fan motor anomaly
1 time flash
Diagnosis
YES
Value in ( ) are for the 3-phase models.
NO
YES
NO
YES
NO
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86
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'10 • PAC-SM-137 '10 • PAC-SM-137A
Countermeasure
Defective inverter PCB
Replace.
Broken harness wire
Replace fan motor.
Defective outdoor control
PCB Replace.