Commercial Air Conditioner
Model: AD09/12/14/182XLERA
-33
-
Note: Float switch is close in normal state, when being activated, it is
open. Voltage between both ends is 0V when close,
approximately 5V
when open.
no
Adjust bracket
Is float switch holder tinted
that float can't move, or too
close to pump motor that
interference arises?
Check if float switch is
in good condition with
multimeter
Replace float switch
if the drain pan is too
dirty to cause the invalid
float switch
if pump motor is
normal
clean drain pan
replace pump motor
Is drain pipe blocked?
yes
clean the drain pipe
and water pump
6
) Fault in drain system
Confirm float switch failure
according to the fault code list
no
yes
yes
yes
no
no
no
yes
Replace indoor PCB
Is supply transformer
component in good condition?
yes check if wiring
is correct
check if failure disappears after
changing transformer or PCB
no
no
check if failure disappears after
changing wired controller
yes wired controller is
broken
7
) Communication failure between wired controller and indoor PCB
or no display on wired controller
Confirm commumication failure
according to the fault code list
or no display
yes
yes
for some models, when powered on,
initialization will display 88, if initrialization
cannot finish, check indoor dip switch position
no
Is voltage between A and
B of wired controller 12V?
yes
yes
yes
Is voltage between B
and C fluctuating?
replace PCB
no
no
no
check if the wired controller
can match with indoor PCB
replace wired controller
no
Is power just turned on?
check if the dip
switch position on
PCB is right
correct the position