Haier HSU24VHG(DB)-G&W Service Manual page 53

Turn off power supply and rotate
fan by hand
Does fan rotate
smoothly?
Yes
Turn power ON and operate fan
Does it rotate?
Yes
Stop fan motor
Is rotation number
command pulse
generated?
Replace indoor fan motor
PCB
NO
No
Turn off power supply and disconnect fan
motor connector, then turn power ON
Check output of fan motor connector
Yes
No
52
Replace fan motor
Is motor power
voltage DC310V
g e n e r a t e d ?
Yes
Is motor control power
voltageDC15V
generated?
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