Error Codes [4250, 4255, 4256] Detail Code 104 - Mitsubishi Electric R410A Service Handbook

[7-5 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-5-25

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 fail-
ure
For inverter-related error codes, refer to the following page(s).
[8-9 Troubleshooting Inverter Problems (TLMU)](page 264)
[8-10 Troubleshooting Inverter Problems (YLMU)](page 276)
HWE14080
Check method and remedy
Refer to the following page(s).
(TLMU)
[8-9-3 Checking the Compressor for Ground Fault and Coil Resistance Problems](page 266)
(YLMU)
[8-10-3 Checking the Compressor for Ground Fault and Coil Resistance Problems](page
278)
Refer to the following page(s).
(TLMU)
[8-9-2 Checking the Inverter Board Error Detection Circuit](page 266)
[8-9-3 Checking the Compressor for Ground Fault and Coil Resistance Problems](page 266)
[8-9-4 Checking the Inverter for Damage at No-Load](page 267)
[8-9-5 Checking the Inverter for Damage during Compressor Operation](page 268)
[8-9-10 Checking the Installation Conditions](page 270)
(YLMU)
[8-10-2 Checking the Inverter Board Error Detection Circuit](page 278)
[8-10-3 Checking the Compressor for Ground Fault and Coil Resistance Problems](page
278)
[8-10-4 Checking the Inverter for Damage at No-Load](page 278)
[8-10-5 Checking the Inverter for Damage during Compressor Operation](page 279)
[8-10-10 Checking the Installation Conditions](page 281)
Check method and remedy
Refer to the following page(s).
(TLMU)
[8-9-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems](page 268)
(YLMU)
[8-10-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems](page 279)
Refer to the following page(s).
(TLMU)
[8-9-7 Checking the Fan Board Error Detection Circuit at No Load](page 268)
[8-9-8 Checking the Fan Inverter for Damage at No Load](page 269)
[8-9-9 Checking the Fan Inverter for Damage with Load](page 270)
(YLMU)
[8-10-7 Checking the Fan Board Error Detection Circuit at No Load](page 279)
[8-10-8 Checking the Fan Inverter for Damage at No Load](page 280)
[8-10-9 Checking the Fan Inverter for Damage with Load](page 281)
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