Open-Circuited Ipm/Loose Acct Connector (Indoor Unit) - Mitsubishi City Multi PEFY-P72NMHSU-E Technical & Service Manual

1. Error Code
5305

Open-circuited IPM/Loose ACCT connector (Indoor unit)

2. Error definition and error detection method
ACCT sensor detected that not enough current is available.
3. Cause, check method and remedy
Cause
(1) Disconnected ACCT sensor
(2) ACCT sensor fault
(3) Inverter failure or 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)
1. Error Code
5701
Loose float switch connector
2. Error definition and error detection method
Detection of the disconnected float switch (open-phase condition) during operation
3. Cause, check method and remedy
(1) CN4F disconnection or contact failure
Check for disconnection of the connector (CN4F) on the indoor controller board.
HWE10170
Check method and remedy
Check CNCT2 on the INV board for proper connection.
Disconnect the CNCT2 connector, and check the resistance between
the terminals.
Refer to [8] 3.4.(page 50)
1) Refer to [8] 3.2.[2].(page 48)
2) Refer to [8] 3.2.[4].(page 49)
3) If no problems were found with items 1) and 2) above and the prob-
lem persists after resuming operation, replace the INV board and the
ACCT sensor.
4) If the problem persists after taking step 3) above, replace the fan mo-
tor.
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