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Part 4 - Diagnosis and T
roubleshooting
4.21.4 Procedure
PU/FF
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Some power wires or communication
wires of fan module are not connected
properly1
The fan motor is blocked or has failed2
The power supply is abnormal
Voltage between P and N on fan module
is abnormal3
Replacing the fan module resolves the
error
Replace main PCB
Ensure power and communication wires
are connected properly
Remove obstruction or replace the fan
motor
Check the power supply equipment
Replace AC filter board
Notes:
1. Refer to Figures 4-1.2, 4-1.4 and 4-1.6 in Part 4, 1 “Outdoor Unit Electric Control Box Layout”.
2. Refer to Part 2, 1 “Layout of Functional Components”.
3. The normal voltage between P and N on the fan module is 310~340V DC. Refer to Figures 4-1.2 and 4-1.4 in Part 4, 1 “Outdoor Unit Electric Control Box
Layout” and to Figure 4-2.6 in Part 4, 2.6 “Fan module power board”
