Haier HSU-07HEA03/R2 - Page 14

Replace indoor unit
PCB
Does fan rotate
smoothly?
NO
Replace fan motor
Yes
Turn power ON and operate fan
Does it rotate?
No
Yes
Turn off power supply and disconnect
fan motor connector,then turn power
Check output of fan motor connector
NO
Yes
Is motor power voltage DC310V between
the red wire and the black wire of
Terminal CN601 generated?
NO
Stop fan motor
Is rotation number
command pulse
g
enerated?
Replace fan
motor
Yes
Yes
Replace indoor unit PCB
No
No
Replace indoor fan motor
Yes
Is motor power voltage DC15V between
the white wire and the black wire of
Terminal CN601 generated?
Is rotation number command voltage
DC1~6V between the yellow wire and the
black wire of Terminal CN601 generated?
Turn off power supply
and rotate fan by hand
Replace indoor unit
PCB
HSU-18,22HEA03/R2 Service Diagnosis
68
Domestic Air Conditioner