Haier HSU-22LEA03 Service Manual page 52

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
HSU-22L/HEA03
NO
No
Turn off power supply and disconnect
fan motor connector,then turn power
Check output of fan motor connector
Is motor power voltage
DC310V gengerated?
Is motor control power
voltageDC15Vgenerated?
Yes
Is rotation number
commamd voltage
DC1 6V generated?
Replace indoor unit PCB
No
fan motor
49
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Codes and description
Replace fan motor
Replace indoor unit
PCB
Yes
Replace indoor unit
Yes PCB
No
Domestic air conditioner
NO
NO
Yes
Replace fan
motor