Hitachi FSXN Series Service Manual page 205

8 Troubleshooting
19
Alarm code
• The RUN indicator flashes and the ALARM indication is displayed on the remote control switch.
• The unit no., the alarm code and the unit code are alternatively displayed in the temperature setting section and the unit
no. and alarm code are displayed on the outdoor unit's PCB1 display.
* This alarm is indicated when the indoor unit fan motor internal thermostat temperature is higher than 130 °C, 135 °C,
140 °C and 145 °C.
130 °C: RCD, RPK and RPF(I).
135 °C: RPC and RPIM.
140 °C: RPI.
145 °C: RCI and RCIM.
No
Does the indoor
at the internal thermostat
fan run?
Yes
Check indoor temperature.
If it is unusual, take suitable
action to reduce it.
Phenomenon
Activation
of Internal
Thermostat for
Indoor Unit
Faulty
Fan Motor
Internal
Thermostat
199
SMGB0065 rev. 1 - 12/2010
Activation of the protection device for the indoor unit fan motor (all models except RCI and
RPK).
No
Is continuity present
of indoor fan motor?
Yes
Yes
Is connection bad at
the connector?
No
No
Is the coil resistance
of fan motor normal?
Yes
Cause
Faulty Indoor Unit
Fan Motor
Check continuity after
Fault fan motor temperature
decreases to room temp.
Insufficient
Contacting
Incorrect
Connection
PCB1: Control PCB in Outdoor Unit
Yes
No
Is fan motor hot? Replace the motor.
Repair wiring and
connections.
Replace the motor.
Check Item
(Turn OFF Main Switch)
Measure coil
resistance and Replace motor if faulty.
insulation resistance.
Measure resistance
by tester.
Check connections.
Action
Replace fan motor if
no continuity.
Correct looseness.
Replace connectors.
Repair connections.
8