Mitsubishi FDT100VNXWVH Service Manual page 160

Error code Indoor display
Remote control:
E41
Outdoor unit
Outdoor unit
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 unit 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
Keeps flashing
control PCB
Yellow LED
6-time flash
5. Troubleshooting
• Single phase models (FDC100-140VNX-W)
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 (FDC100-140VSX-W)
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
159
- -
'20 • PAC-SM-351
Countermeasure
Replace inverter PCB.
YES
If not solved, replace
noise filter PCB as well.
Replace outdoor fan motor.
YES
Replace outdoor unit control PCB.
NO
If not solved, replace
inverter PCB as well.