Panasonic WH-ADC0916G9E8 WH-UX09FE8 Service Manual page 128

17.5.20 Outdoor Fan Motor (DC Motor) Mechanism Locked (F15)
Malfunction Decision Conditions:
The rotation speed detected by the Hall IC of the fan motor during fan motor operation is used to determine
abnormal fan motor (feedback of rotation > 2550 rpm or < 50 rpm).
Malfunction Caused:
1 Operation stop due to short circuit inside the fan motor winding.
2 Operation stop due to breaking of wire inside the fan motor.
3 Operation stop due to breaking of fan motor lead wires.
4 Operation stop due to fan motor Hall IC malfunction.
5 Operation error due to faulty outdoor unit PCB.
Abnormality Judgment:
Continue 2 times in 30 minutes.
Troubleshooting:
Turn OFF the power and
operate the fan by hand.
Does the fan rotate
smoothly?
Yes
Turn ON the power and
operate the fan motor.
Does it rotate?
Yes
Stop the fan motor.
Check the rotation feedback
output from the fan motor.
Rotate the fan motor by hand, is the
rotation feedback voltage 15 Vdc
(pin 6 & 4) generated?
Yes
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
No
Replace the fan motor.
No
No
Replace the fan motor.
Replace the outdoor unit
PCB (main).
Turn OFF the power and
disconnect the fan motor
connector. Turn ON the power.
Check the output of the fan motor
from outdoor unit PCB (main)
Is the fan motor power supply voltage
~325 Vdc (pin 1 & 4) generated?
Yes
Is the fan motor control voltage
15 Vdc (pin 5 & 4) generated?
Yes
Operate the fan motor, is the
rotation command voltage 1-5 Vdc
(pin 7 & 4) generated?
Yes
128
No
Replace the outdoor unit
PCB (main).
No
Replace the outdoor unit
PCB (main).
No
Replace the outdoor unit
PCB (main).
Replace the fan motor.