Sinclair SCV-750EB Service Manual page 119

Procedure
Some power wires or communication wires
of fan module are not connected properly
The fan motor is blocked or has failed
The power supply is abnormal
Voltage between P and N on fan module is
Replacing the fan module resolves the error
Replace main PCB
Notes:
1. Refer to Part 4, 3 "Wiring diagram" and PCB components to make sure wire connection is firm.
2. The normal voltage between P and N on the fan module is 650V DC. Refer to Part 4, 1 "Outdoor Unit Electric Control Box Layout" and to Part 4, 2.4 "Fan
module board".
PU/FF
No
No
No
No
abnormal 2
No
No
Ensure power and communication wires are
Yes
1
Yes
Remove obstruction or replace the fan motor
Yes
Check the power supply equipment
Yes
connected properly
Replace AC filter board
117