Panasonic CU-3E19RBU-5 Service Manual page 76

15.2.11 H97 (Outdoor Fan 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 stop due to short circuit inside the fan motor winding.

Operation stop due to breaking of wire inside the fan motor.

Operation stop due to breaking of fan motor lead wires.

Operation stop due to Hall IC malfunction.

Operation error due to faulty outdoor unit PCB.
Abnormality Judgment:

2 times happen within 30 minutes.
Troubleshooting
Turn off power supply
and rotate fan by hand.
Does fan rotate smoothly?
Yes
Turn power supply on
and operate fan.
Does it rotate?
Stop fan motor.
Check the rotation feedback
output from fan motor.
Rotate the fan motor by hand, is
the rotation feedback voltage
5Vdc (pin4 & 7) generated?
For safety reason and to prevent component
breakdown, always switch off the power before
Caution
remove and connect the component.
No
Replace fan motor.
No
No
Replace fan motor.
Replace outdoor PCB.
Yes
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 (pin1 & 4) generated?
Yes
Is the motor control voltage
15Vdc (pin4 & 5) generated?
Yes
Operate the fan, is the rotation
command voltage 1-5Vdc (pin4
& 6) generated?
76
No
Replace outdoor PCB.
No
Replace outdoor PCB.
No
Replace outdoor PCB.
Yes
Replace fan motor.