Mitsubishi Electric PUHY-P200 Service Handbook page 232

[ IX Troubleshooting ]
1. Error Code
4220
4225
Low bus voltage at startup (Detail code 131)
2. Error definition and error detection method
When Vdc 160 V is detected just before the inverter operation.
3. Cause, check method and remedy
(1) Inverter main circuit failure
Same as detail code 108 of 4220 error
Refer to section -6- "Inverter" under part [4] Troubleshooting Principal Parts for error codes related to the inverter.(page 285)
4230
1. Error Code
4230
Heatsink overheat protection
2. Error definition and error detection method
When the heat sink temperature (THHS) remains at or above 105°C [221°F] is detected.
3. Cause, check method and remedy
Cause
(1) Fan board failure
(2) Outdoor unit fan failure
(3) Air passage blockage
(4) THHS failure
Refer to section -6- "Inverter" under part [4] Troubleshooting Principal Parts for error codes related to the inverter.(page 285)
HWE10040
Refer to IX [4] -6- (2) [6].(page 288)
Check the outdoor unit fan operation.
If any problem is found with the fan operation, check the fan motor. ->Refer to
IX [4] -6- (2) [5].(page 288)
Check that the heat sink cooling air passage is not blocked
1) Check for proper installation of the INV board IGBT. (Check for proper instal-
lation of the IGBT heatsink.)
2) Check the THHS sensor reading on the LED monitor.
->If an abnormal value appears, replace the INV board.
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Check method and remedy
GB