Hitachi FS3 Series, Service Manual, Page: 46 / 240

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38
TROUBLESHOOTING
Alarm Code
19
Activation of Protection Device for Indoor Fan Motor
(except RPK-Model)
n
”RUN” light flickers and ”ALARM” is indicated on the remote control switch.
n
The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the
unit No. and alarm code are indicated on the display of the outdoor unit PCB.
‘
This alarm code is indicated when the temperature of the internal thermostat for the indoor fan motor is
higher than 130 °C.
Yes
Does the indoor
fan run?
No
Is continuity present at
the internal thermostat of
indoor fan motor?
No
Is fan motor hot?
No
Replace the motor.
Yes Yes
Is connection bad at the
connector?
No
Repair wiring and
connections.
Yes
Is the coil resistance of
fan motor normal?
No
Replace the motor.
Yes
Check indoor temperature.
If it is unusual, take
suitable action to reduce it.
Phenomenon Cause Check Item
Action
(Turn OFF main switch)
Faulty Indoor Unit Fan Motor
Measure coil resistance
and insulation resistance.
Replace motor if faulty.
Fault
Check continuity after Fan
motor temperature
decreases to room temp.
Replace fan motor if no
continuity
Insufficient
Contacting Measure resistance by
tester.
Correct Looseness.
replace connectors.
Activation of
Internal
Thermostat for
Indoor Unit Fan
Motor
Faulty
Internal
Thermostat
Incorrect
Connection
Check connections. Repair connections.