150
Troubleshooting
Alarm
Code
1Q
Activation of Protection Device for Indoor Fan Motor ( Indoor Unit with AC Motor )
● The RUN indicator (Red) is ashing
● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on
LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB.
★
This alarm code is indicated when over approximately 1A is applied to the indoor unit fan motor.
Cause Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Activation
of Internal
Thermostat for
Indoor Unit
Fan Motor
Measure resistance
by tester.
Check continuity after
fan motor temperature
decreases to room temp.
Faulty
Internal
Thermostat
Fault
Replace fan motor if
no continuity.
Correct looseness.
Replace connectors.
Insufficient
Contacting
Check connections.
Repair connections.
Incorrect
Connection
Measure coil
resistance and
insulation resistance.
Replace motor if faulty.
Faulty Indoor Unit
Fan Motor
Yes
Yes
Yes
Replace the motor.
No No No
Repair wiring and
connections.
No
Replace the motor.
No
Yes
Does the indoor
fan run?
Yes
Is fan motor hot?
Is continuity present
at the internal thermostat
of indoor fan motor?
Is connection bad at
the connector?
Is the coil resistance
of fan motor normal?
Check indoor temperature.
If it is unusual, take suitable
action to reduce it.