Activation Of The Protection Device For The Indoor Fan Motor (Except Rci-Fsn3, Rcim-Fsn3, Rpc- Fsn3 And Rpk-Fsn(H)3M) - Hitachi RAS-(3-6)HVNC1(E) Service Manual

8 Troubleshooting
19
Alarm code
- This alarm code is displayed when the temperature of the internal thermostat for the indoor fan motor is higher than
135 ºC.
Does the indoor
fan run?
Yes
Phenomenon
Activation of the internal
thermostat for the indoor
unit fan motor
244
SMGB0087 rev.0 - 12/2013
Activation of the protection device for the indoor fan motor (except RCI-FSN3, RCIM-FSN3, RPC-
FSN3 and RPK-FSN(H)3M)
Is the continuity present at the
No
internal thermostat of the indoor
fan motor?
Is the connection bad at the
connector?
Is the coil resistance of the fan
motor normal?
Check the indoor temperature.
If the indoor temperature is unusual,
take a suitable action to reduce the
indoor temperature
Cause
Faulty indoor unit fan motor
Fault
Faulty internal
thermostat
Insufficient contacting
Incorrect connection
No
Is the fan mo-
tor hot?
Yes
Yes
No
No
Yes
Check item
Measure the coil
resistance and the
insulation resistance
Check the continuity
after the fan motor
temperature decreases
to room temp
Measure the resistance
by means of the tester
Check the connections
Yes
No
Replace the motor
Repair the wiring and
the connections
Replace the motor
Action
(Turn OFF the main switch)
Replace the motor if faulty
Replace the fan motor if there
is no continuity
Correct looseness.
Replace the connectors
Repair the connections