Haier Arc Series Service Manual page 55

Turn off power supply and rotate fan by hand
Does fan rotate
smoothly?
YES
Check output of fan
connector and Turn power ON and
operate fan
Does it rotate? YES
YES
Check rotation pulse input
(pins 4-7).
Is there rotation
pulse input?
YES
Replace indoor unit PCB
HSU-24C03/Z HSU-24H03/Z
NO
motor
NO
NO
Replace fan motor
52
Replace fan motor
Turn off power supply and disconnect
fan motor connector,then turn power
Check output of fan motor connector
Is motor power voltage
DC310V generated?
YES
Is motor control power
voltageDC15Vgenerated?
YES
Is rotation number command
voltage DC1 6V generated?
NO
Replace indoor unit PCB
Service Diagnosis
NO
Replace indoor unit PCB
NO
Replace indoor unit PCB
YES
Replace fan motor
Domestic Air Conditioner