Mitsubishi City Multi PEFY-P72NMHSU-E, Technical & Service Manual, Page: 35 / 76

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HWE10170 GB
1. Error Code
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
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
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.
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Cause Check method and remedy
(1) Disconnected ACCT sensor Check CNCT2 on the INV board for proper connection.
(2) ACCT sensor fault Disconnect the CNCT2 connector, and check the resistance between
the terminals.
Refer to [8] 3.4.(page 50)
(3) Inverter failure or fan motor error 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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