Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 324

Error code
Indoor control PCB
Remote control:
E41
Outdoor control PCB
Outdoor inverter
1. Applicable model
All models
2. Error detection method
When less than DC14V of
the output voltage is detected
between ② and ③ on CNI3,
E41 is displayed.
(See "Note" mentioned below)
3. Condition of Error displayed
Seme as above.
4. Presumable cause
• Inverter PCB anomaly
• Outdoor fan motor anomaly
• Outdoor control PCB
anomaly
• Noise filter PCB anomaly
Note:
The "Single phase models" of inverter PAC have no function to output the signal for the power transistor overheat. However
since the power source for the power transistor and the outdoor fan motor is in the same line, when the anomaly of the
outdoor fan motor occurs, E41 is displayed.
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
6 times flash
5. Troubleshooting
• Single phase models (FDC100-140VN)
Is DC15V detected
between ② and ③ on
CNI3?
NO
Is DC15V
detected after disconnecting
outdoor fan motor?
Note(2) How to check the voltage between ② and ③ of CNI3?
⇒See E51
• 3-phase models (FDC100-140VS)
E41⇒Replace inverter PCB.
Red
Content
Stays OFF
1 time flash
Power transistor overheat
Diagnosis
⑴ ⑵
YES
Note(1) Under anomalous conditions,
the voltage becomes less than DC14V.
⑴
YES
NO
323
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'12 • PAC-T-178
Countermeasure
Replace inverter PCB
If not solved, replace
Noise filter PCB as well
Replace outdoor fan motor
Replace outdoor control
PCB
If not solved, replace
inverter PCB as well