Mitsubishi Electric PURY-P72 Service Handbook page 238

[ IX Troubleshooting ]
1. Error Code
4250
4255 (YKMU-A)
4256
IPM error (Detail code 101)
2. Error definition and error detection method
In the case of 4250
Overcurrent is detected by the overcurrent detection resistor (RSH) on the INV board.
In the case of 4255 and 4256
IPM error signal is detected.
3. Cause, check method and remedy
In the case of 4250
Cause
(1) Inverter output related
In the case of 4255 and 4256
Cause
(1) Fan motor abnormality
(2) Fan board failure
Refer to section -7- "Inverter (YKMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 321)
HWE1116D
Check method and remedy
Refer to IX [4] -7- (2) [1] - [4], [9].(page 323)
Check the IGBT module resistance value of the INV board, if no
problems are found.
(Refer to the Trouble shooting for IGBT module)(page 328)
Check method and remedy
Refer to IX [4] -7- (2) [5].(page 325)
Refer to IX [4] -7- (2) [6], [7], [8].(page 325)
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