Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 157

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-17 Error Codes [4250, 4255, 4256] Detail Code 104
1. Error code definition
Short-circuited IPM/Ground fault (Detail code 104)
2. Error definition and error detection method
When IPM/IGBT short damage or grounding on the load side is detected just before starting the inverter.
3. Cause, check method and remedy
In the case of 4250
Cause
(1) Grounding fault compressor
(2) Inverter output related
In the case of 4255 and 4256
Cause
(1) Grounding fault of fan motor
(2) Fan board failure
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems]
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Check method and remedy
Refer to the following page(s).
[8-9-3 Checking the Compressor for Ground Fault and Coil Resistance
Problems]
Refer to the following page(s).
[8-9-2 Checking the Inverter Board Error Detection Circuit]
[8-9-3 Checking the Compressor for Ground Fault and Coil Resistance
Problems]
[8-9-4 Checking the Inverter for Damage at No-Load]
[8-9-5 Checking the Inverter for Damage during Compressor Operation]
[8-9-11 Checking the Installation Conditions]
Check method and remedy
Refer to the following page(s).
[8-9-7 Checking the Fan Motor for Ground Fault and Coil Resistance
Problems]
Refer to the following page(s).
[8-9-8 Checking the Fan Board Error Detection Circuit at No Load]
[8-9-9 Checking the Fan Board for Damage at No Load]
[8-9-10 Checking the Fan Board for Damage with Load]
BS_07_C