Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook page 146

[ IX Troubleshooting ]
1. Error Code
4220
4225
Logic error (Detail code 111)
2. Error definition and error detection method
H/W error
If only the H/W error logic circuit operates, and no identifiable error is detected.
3. Cause, Check method and remedy
In the case of 4220
(1) External noise
(2) INV board failure
(3) IPM failure
(4) DCCT failure
In the case of 4225
(1) External noise
(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
Cause
Cause
- 137 -
Check method and remedy
Refer to 9 [4] - 6 - (2) [1].(page 198)
Replace the IPM.
Replace the DCCT.
Check method and remedy
Refer to 9 [4] - 6 - (2) [6].(page 199)
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