Mitsubishi Heavy Industries SRK100VNXPZSX Technical Manual page 147

Error code Indoor display
Remote control:
E51
Outdoor unit
Outdoor unit
inverter PCB
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 unit control
PCB
Note:
RUN light
ON
Green LED
Keeps flashing
control PCB
Yellow LED
6-time flash
5. Troubleshooting
• Model FDC100-140VNX
detected between ② and ③
detected after disconnecting
• Model FDC100-140VSX
Replace immediately the inverter PCB and the power transistor.
Note(2) How to check the voltage between ② and ③ of CNI3?
TIMER light
Content
4-time flash
Red LED
Inverter and fan motor anomaly
1-time flash
Diagnosis
⑴ ⑵
Is DC15V
on CNI3?
Note(1) Under anomalous conditions,
the voltage becomes less than
NO
DC14V.
⑴
Is DC15V
outdoor fan motor?
146
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'17 • PAC-T-257
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.
② ： 15V (＋)
③ ： GND (−)
③
②