Mitsubishi Electric PURY-P72 Service Handbook page 254

[ IX Troubleshooting ]
1. Error Code
5305
5306
RPM error before start up (Detail code 134)
2. Error definition and error detection method
The fan RPM will not drop to the set RPM.
3. Cause, check method and remedy
Cause
(1) Outdoor factors
(2) Fan board failure
(3) Fan motor error
Refer to section -7- "Inverter" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 310)(page 321)
5401
1. Error Code
5401
Humidity sensor fault
2. Error definition and error detection method
ŒA 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
HWE1116D
Check that there is no wind (gust or strong wind).
Refer to IX [4] -7- (2) [7], [8] (page 314)(page 325)
Refer to IX [4] -7- (2) [5] (page 314)(page 325)
Cause
Check method and remedy
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.
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