Haier U Series Service Manual page 74

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
YES
Does it rotate?
YES
Check rotation pulse
input (pins 4-7).
Is there rotation
pulse input?
YES
Replace indoor unit PCB
NO
motor
NO
NO
Replace fan motor
71
Replace fan motor
Turn off power supply and disconnect
fan motor connector,then turn power
Check outpue of fan motor connector
Is motor power voltage
DC310V gengerated?
YES
Is motor control power
voltageDC15Vgenerated?
YES
Is rotation number commamd
voltage DC1 6V generated?
NO
Replace indoor unit PCB
NO
Replace indoor unit PCB
NO
Replace indoor unit PCB
YES
Replace fan motor
Domestic Air Conditioner