Panasonic WH-SXC09H3E8 Service Manual page 193

16.5.29 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
rotate 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 15Vdc
(pin6 & 4) generated?
Yes
No
Replace the fan motor.
No
No
Replace the fan motor.
Replace the outdoor unit
PCB (main).
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
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
~325Vdc (pin1 & 4) generated?
Yes
Is the fan motor control voltage
15Vdc (pin5 & 4) generated?
Yes
Operate the fan motor, is the
rotation command voltage 1-5Vdc
(pin7 & 4) generated?
Yes
193
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.