Panasonic CS-HZ9RKE-1 Service Manual page 92

17.4.6 H19 (Indoor 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
(feedback of rotation > 2550rpm or < 50rpm)
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 indoor 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 indoor PCB
Is the motor power supply voltage 280 ~ 340Vdc (pin 1 & 4)
generated?
Is the motor control voltage 15.8 ± 1.2Vdc (14.6 ~ 17Vdc)
(pin 5 & 4) generated?
Operate the fan, is the rotation command voltage 0.5 ~ 6Vdc
(pin 7 & 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
Check the rotation output from fan motor
Is the rotation feedback voltage 5 ~ 15Vdc (pin 6 & 4)
generated?
NO
NO
NO
● Replace indoor PCB
● Replace fan motor
92
NO
YES