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17.4.16 H97 (Outdoor Fan Motor – DC Motor Mechanism Locked)
17.4.16.1 CU-Z20/25/35/42/50/60/71TKR
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
YES
NO
When abnormality indication starts again
Turn off power supply and disconnect
CN-MTR2 connector. Connect inverter
checker to CN-MTR2 then turn power on.
Replace fan motor
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Caution
Does fan rotate smoothly?
Is all 6 LED on and off periodically?
NO
Main outdoor PCB transistor faulty Replace outdoor PCB
Turn off power supply and rotate fan by
hand
Check the output of fan motor from outdoor
PCB
NO
Fan motor faulty Replace fan motor
YES
Check fan motor winding U-V, V-W, U-W.
Is value consistent in all readings?
YES
Is the fan motor rotation start and stop
intermittently during initial running?
YES
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