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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
HSU24VHJ DB
NO
No
Turn off power supply and disconnect fan
motor connector,then turn power ON
Check output of fan motor connector
Is motor control power
voltageDC15Vgenerat
Y
Replace indoor unit
PCB
No
54
Replace fan motor
I s m o t o r p o w e r
voltage DC310V
Yes
Yes
Is rotation number
commamd voltage
DC1 6V
No
Domestic Air Conditioner
Service Diagnosis
NO
Replace indoor unit
PCB
NO
Replace indoor
unit PCB
Yes
Replace fan motor
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