Mitsubishi Electric FDT125VNVF Technical Manual page 441

Indoor display
Error code
E41
Remote controller:
inverter PCB
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
Same as above.
4. Presumable cause
• Defective inverter PCB
• Defective outdoor fan motor
• Defective outdoor control
PCB
• Delective noise filter PCB
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.
RUN light
–
Green LED
Outdoor
control PCB
Keeps flashing
Yellow LED
Outdoor
6 times flash
5. Troubleshooting
• Single phase models
Is DC15V detected
between ② and ③ on
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
E41⇒Replace inverter PCB
TIMER light
Content
–
Red LED
Power transistor overheat
1 time flash
Diagnosis
⑴ ⑵
CNI3?
Note(1) Under anomalous conditions,
NO
the voltage becomes less than DC14V.
⑴
440
- -
'12 • PAC-T-174
Countermeasure
Replace inverter PCB
YES
Replace outdoor fan motor
YES
Replace outdoor control PCB
NO
If not solved, replace
inverter PCB as well