Error Codes [4250, 4255, 4256] Detail Code 101 (Tlmu) - Mitsubishi Electric R410A Service Handbook

[7-5 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-5-22

Error Codes [4250, 4255, 4256] Detail Code 101 (TLMU)

1. Error code definition
IPM error (Detail code 101)
2. Error definition and error detection method
In the case of 4250
P72, P96, P120, P144 models
Overcurrent is detected by the overcurrent detection resistor (RSH) on the INV board.
P168 model
IPM error signal is detected.
In the case of 4255 and 4256
IPM error signal is detected.
3. Cause, check method and remedy
In the case of 4250
P72, P96, P120, P144 models
Cause
(1) Inverter output related
P168 model
Cause
(1) Inverter output related
(2) Same as 4230 error
In the case of 4255 and 4256
Cause
(1) Fan motor abnormality
(2) Fan board failure
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems (TLMU)](page 264)
HWE14080
Check method and remedy
Refer to the following page(s).
[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 Opera-
tion](page 268)
[8-9-10 Checking the Installation Conditions](page 270)
Check method and remedy
Refer to the following page(s).
[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 Opera-
tion](page 268)
[8-9-10 Checking the Installation Conditions](page 270)
Same as 4230 error
Check method and remedy
Refer to the following page(s). [8-9-6 Checking the Fan Motor for Ground
Fault and Coil Resistance Problems](page 268)
Refer to the following page(s).
[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)
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