Panasonic CS-E12RB4UW Service Manual page 73

15.4.13 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
When abnormality indication starts again.
Turn off power supply and rotate fan by hand.
Does fan rotate smoothly?
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?
Check fan motor winding U-V, V-W, U-W.
Is value consistent in all readings?
Is the fan motor rotation start and stop intermittently during
initial running?
YES
YES
YES
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.
73
• Replace outdoor PCB.
• Replace fan motor.