Panasonic CS-MS9SD3H Service Manual page 55

13.5.13 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 power supply on and operate fan
Does it rotate?
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 15Vdc (pin 3 & 4) generated?
Operate the fan, is the rotation command voltage 1~5Vdc (pin 2
& 4) generated?
YES
NO
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
YES
Stop fan motor
Check the rotation feedback output from fan motor
Rotate the fan motor by hand, is the rotation feedback
voltage 15Vdc (pin 1 & 4) generated?
NO
NO
NO
● Replace outdoor PCB
● Replace fan motor
55
YES
NO