Mitsubishi Electric PURY-P72TYJMU-A Service Handbook page 238

[ IX Troubleshooting ]
1. Error Code
4250
(YJMU-A)
4255
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
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
Cause
(1) Fan motor abnormality
(2) Fan board failure
(3) Electromagnetic contactor (52F)
actuation failure (P120, P144 on-
ly)
Refer to section -7- "Inverter (YJMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 320)
HWE0913A
Check method and remedy
Refer to IX [4] -7- (2) [1] - [4].(page 322)
Check the IGBT module resistance value of the INV board, if no
problems are found.
(Refer to the Trouble shooting for IGBT module)
Check method and remedy
Refer to IX [4] -7- (2) [5].(page 323)
Refer to IX [4] -7- (2) [6].(page 323)
Check the wiring between the FAN board, 52F, and fan motor.
(page 295)
- 229 - GB