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15.4.15 H97 (Outdoor 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.
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 outdoor unit PCB.
Troubleshooting
Turn off power supply and rotate fan by hand.
When abnormality indication starts again
Replace fan motor
Does fan rotate smoothly?
Turn power supply on and operate fan.
Does it rotate? Stop fan motor.
Check the rotation feedback output from fan motor.
Rotate the fan motor by hand, is the rotation feedback
voltage 15 Vdc (pin 1 & 4) generated?
Turn off power supply and disconnect fan motor connector,
then turn power on.
Check the output of fan motor from outdoor PCB.
Is the motor power supply voltage ~325Vdc (pin 7 & 4)
generated?
Is the motor control voltage 15 Vdc (pin 3 & 4) generated?
Operate the fan, is the rotation command voltage 1~5Vdc (pin 2
& 4) generated?
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Replace outdoor PCB
Replace fan motor
Caution
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