Haier AS09/12GS2ERA Service Manual page 66

A
Check the status of LED1
on the indoor mainboard. If
the LED1 blinks
Test the outdoor power supply
(230VAC and +310VDC) with a
multimeter.
If both 230VAC and 310DC
are available,
+12V(from7805)is available.
YES
If the LED1 is off within two minutes
after the machine is supplied with
power, measure the AC voltage
between positions 1 and 3 on the
terminal of outdoor
multimeter.
If the value varies between 0 and 80
VAC, the outdoor mainboard is
damaged, replace it with a new one.
AS09/12GS2ERA 1U09/12BS1ERA-SM
No
If 230VAC is available but
310DC not, the power module is
damaged, replace it with a new
one.
measure
unit with a
Yes
measure
Jumpers 3 and 4 of IC8 on the indoor
mainboard with a multimeter.
If the voltage is of a
constant value of 0V
DCto5V DC
NO
The
damaged; replace it with a new
one.
The outdoor mainboard is
damaged; Replace them with a
new one.
If the value is constant at about 30V,
the indoor mainboard is damaged,
replace it with a new one.
The outdoor mainboard is damaged;
replace it with a new one.
3
Servive Diagnosis
the voltage between
Yes
indoor mainboard
Domestic air conditioner
is
NO