Mitsubishi Electric City Multi PFAV-P500VMH-E, Service Handbook

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[
X
Troubleshooting ]
- 118 -
HWE07150 GB
1. Error Code
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] "Trouble shooting principal parts" for error codes related to the
inverter.(page 172)
1. Error Code
Heatsink overheat protection
2. Error definition and error detection method
When the heat sink temperature (THHS) remains at or above 100°C [212°F] is detected.
3. Cause, check method and remedy
Refer to section - 6 - "Inverter" under part [4] "Trouble shooting principal parts" for error codes related to the
inverter.(page 172)
4220
4225
4230
Cause Check method and remedy
(1) Fan board failure Refer to
X
[4] - 6 - (2) [6].(page 175)
(2) Outdoor unit fan failure Check the outdoor unit fan operation.
If any problem is found with the fan operation, check the fan motor. ->Refer to
X
[4] - 6 - (2) [5].(page 175)
(3) Air passage blockage Check that the heat sink cooling air passage is not blocked
(4) THHS failure 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.