Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook page 149

[ IX Troubleshooting ]
1. Error Code
4250
4255
IPM error (Detail code 101)
2. Error definition and error detection method
In the case of 4250
IPM error signal is detected.
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
(2) Same as 4230 error
In the case of 4255
Cause
(1) Fan motor abnormality
(2) Fan board failure
Refer to section - 6 - "Inverter" under part [4] "Trouble shooting principal parts" for error codes related to the
inverter.(page 196)
HWE0716A
Check method and remedy
Refer to 9 [4] - 6 - (2) [1] - [4].(page 198)
Same as 4230 error.
Check method and remedy
Refer to 9 [4] - 6 - (2) [5].(page 199)
Refer to 9 [4] - 6 - (2) [6].(page 199)
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GB