Mitsubishi Electric PURY-P120TJMU-A, Service Handbook, Page: 253 / 411

[
IX
Troubleshooting ]
- 244 - HWE0913A GB
1. Error Code
Temperature sensor fault
2. Error definition and error detection method
Œ
A short-circuit or an open-circuit of the humidity sensor is detected during operation.
3. Cause, check method and remedy
5401
Cause Check method and remedy
(1) Connector contact failure (CN30) (Loose con-
nector) 1) Check the connector for proper contact.
Reconnect the connector, and operate the unit to check for
proper operation.
(2) Broken or partially broken humidity sensor wire 2) Check for broken humidity sensor wire.
(3) Humidity sensor fault 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) Indoor unit control board (detection circuit) fault 4) If the above items check out okay, replace the indoor unit
control board.