Mitsubishi SRK100VNXWPZSX, Service Manual

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159
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'20 • PAC-SM-351
E41
Power transistor overheat
1. Applicable model
5. Troubleshooting
All models
Diagnosis Countermeasure
NO
Is DC15V detected
between
②
and
③
on
CNI3?
⑴ ⑵
NO
YES
Is DC15V
detected after disconnecting
outdoor fan motor?
⑴
YES
Note(1) Under anomalous conditions,
ࠉࠉ
the voltage becomes less than DC14V.
Note(2) How to check the voltage between
②
and
③
of CNI3?
ࠉࠉࠉ
⇒
See E51
E41
⇒
Replace inverter PCB
• Single phase models (FDC100-140VNX-W)
• 3 phase models (FDC100-140VSX-W)
Replace inverter PCB.
If not solved, replace
noise filter PCB as well.
Replace outdoor fan motor.
Replace outdoor unit control PCB.
If not solved, replace
inverter PCB as well.
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.
Error code
Remote control:
Content
1-time flash Keeps flashing
6-time flash
– –
Indoor display
RUN light TIMER light
Green LED
Yellow LED
Red LED
Outdoor unit
control PCB
Outdoor unit
inverter PCB