Haier AS24GS1ERA - Ipm Protection

AS24GS1/2ERA 1U24GS1ERA-SM Service Diagnosis
Domestic Air Conditioner
66
7.3.3 IPM protection
Does fan rotate
smoothly?
NO
Yes
Turn power ON and operate fan
Does it rotate?
No
Yes
Turn off power supply and disconnect fan
motor connector,then turn power
ON
Check output of fan motor connector
I s m o t o r p o w e r
v o l t a
g
e D C 3 1 0 V
NO
Yes
Replace indoor uni
t
PCB
Replace fan motor
Stop fan motor
Is rotation number
command pulse
g
enerated?
Is motor control power
voltageDC15Vgenerat
Is rotation number
commamd voltage
D
C
1
6
V
NO
Yes
Yes
No
No
Y
Replace indoor unit
PCB
Replace fan motor
Replace indoo
r
unit PCB
Replace indoor fan motor
PCB
Turn off power supply and
rotate fan by hand