Panasonic CS-RZ25TKR Service Manual page 131

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
When abnormality indication starts again
Turn off power supply and rotate fan by
hand
Does fan rotate smoothly?
YES
Turn off power supply and disconnect
CN-MTR2 connector. Connect inverter
checker to CN-MTR2 then turn power on.
Check the output of fan motor from outdoor
PCB
Is all 6 LED on and off periodically?
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
For safety reason and to prevent
component breakdown, always switch
Caution
off the power before remove and
connect the component.
NO
Replace fan motor
NO
Main outdoor PCB transistor faulty
NO
Fan motor faulty
131
Replace outdoor PCB
Replace fan motor