90
17.5.6 H19 (Indoor Fan Motor – DC Motor Mechanism Locked)
Malfunction Decision Conditions
The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor
(feedback of rotation > 2550rpm or < 50rpm).
Malfunction Caused
Operation stops due to short circuit inside the fan motor winding.
Operation stops due to breaking of wire inside the fan motor.
Operation stops due to breaking of fan motor lead wires.
Operation stops due to Hall IC malfunction.
Operation error due to faulty indoor unit PCB.
Troubleshooting
When abnormality indication starts again
Turn off power supply and rotate fan by hand
●
Replace fan motor
Does fan rotate smoothly?
Turn power supply on and operate fan.
●
Replace indoor PCB
●
Replace fan motor
Turn off power supply and disconnect fan motor connector,
then turn power on.
NO
YES
YES
NO
Does it rotate?
Check the rotation feedback output from fan motor.
Rotate the fan motor by hand, is the rotation feedback
voltage 15Vdc (pin 7 & 4) generated?
Check the output of fan motor from indoor PCB
Is the motor power supply voltage ~ 325Vdc (pin 1 & 4)
generated?
Is the motor control voltage 15Vdc (pin 5 & 4) generated?
NO
YES
NO
Operate the fan, is the rotation command voltage 1 ~ 5Vdc
(pin 6 & 4) generated?
NO
Stop fan motor
NO
YES
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Caution
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