Mitsubishi Electric PUHY-HP120TNU-A, Service Handbook

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[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
HWE18240_GB chapter 7 -
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7-6-22 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
In the case of 4255 and 4256
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems]
Cause Check method and remedy
(1) Grounding fault compressor Refer to the following page(s).
[8-9-3 Checking the Compressor for Ground Fault and Coil Resistance
Problems]
(2) Inverter output related 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]
Cause Check method and remedy
(1) Grounding fault of fan motor Refer to the following page(s).
[8-9-7 Checking the Fan Motor for Ground Fault and Coil Resistance
Problems]
(2) Fan board failure 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]