Pioneer WYB-GMFI SERIES Service Manual page 50

9.2.3 Fan speed has been out of control diagnosis
Shut off the power supply and turn on it 5s later
The unit does not work normally
Turn off the unit, rotate the cross
fan. Does it rotate freely?
Yes
Is the fan motor connector and
connection good?
Yes
Is the voltage being applied to the fan
motor?
No
Replace the PCB
9.2.4 Open or short circuit of temperature sensor diagnosis and solution
Check the connections between
the sensors and the PCB. Are the
connections good?
Yes
Replace the sensor and check if
the errors happen again?
No Disassemble the connection between
fan and motor, check if the bearing is
normal. If not, change the bearing. If
yes, follow the below step.
Yes
Yes
48
Replace the fan motor
Replace the outdoor PCB