Mitsubishi Electric PEFV-P72NMHSU-E Technical & Service Manual page 34

1. Error Code
5110
Heatsink temperature sensor (THHS) fault (Indoor unit)
2. Error definition and error detection method
When a short or an open of THHS is detected just before or during the inverter operation.
3. Cause, check method and remedy
Cause
(1) Loose connector
(2) THHS sensor fault
(3) INV board failure
Refer to section [8] Troubleshooting, item 3. DC fan motor (fan motor/INV board) for error codes related to the inverter.
(page 47)
1. Error Code
5305
ACCT sensor circuit fault (Indoor unit)
2. Error definition and error detection method
When abnormal value is detected by the ACCT detection circuit immediately before the inverter starts
3. Cause, check method and remedy
Cause
(1) INV board failure
(2) Fan motor error
Refer to section [8] Troubleshooting, item 3. DC fan motor (fan motor/INV board) for error codes related to the inverter.
(page 47)
HWE1017B
Check method and remedy
Check the CNTH on the INV board for proper connection.
If the problem persists after resuming operation, replace the THHS sensor.
If no problems were found with items (1) and (2) above and the problem per-
sists after resuming operation, replace the INV board.
Check method and remedy
Refer to [8] 3.2.[1].(page 48)
Refer to [8] 3.2.[4].(page 49)
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