Mitsubishi Electric CITY MULTI PEFY-AF1200CFM-E Technical & Service Manual page 21

[ VIII Troubleshooting ]
1. Error Code
5401
Humidity sensor fault
2. Error definition and error detection method
A short-circuit or an open-circuit of the humidity sensor is detected during operation.
3. Cause, check method and remedy
(1) Connector contact failure (CN30) (Loose con-
nector)
(2) Broken or partially broken humidity sensor wire
(3) Humidity sensor fault
(4) Indoor unit control board (detection circuit) fault
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 unit control board.
Refer to the outdoor unit Service Handbook for other error codes.
HWE13100
Cause Check method and remedy
1) Check the connector for proper contact.
Reconnect the connector, and operate the unit to check for
proper operation.
2) Check for broken humidity sensor wire.
3) Check the output voltage across No. 1 and No. 3 pins of
connector CN30 with the connector being connected to the
indoor unit control board.
30% : 1.25V
40% : 1.52V
50% : 1.88V
60% : 2.19V
70% : 2.48V
80% : 2.79V
4) If the above items check out okay, replace the indoor unit
control board.
- 17 -
GB