Haier AU282AHBEA Service Manual page 301

10) Overload in heating cycle
start
Is pipe temperature
sensor in good
condition?
yes
Is filter or indoor
heat exchanger
dirty?
no
In heating mode, indoor motor
speed too low or stop?
no
if failure disappear after
PCB is changed
no
indoor/outdoor
temp. too high
11) Fault in drain system
Confirm float switch failure
according to the fault code list
Is drain pipe blocked?
no
if pump motor is
normal
yes
if the drain pan is too
dirty to cause the invalid
float switch
no
Is float switch holder tinted
that float can't move, or too
close to pump motor that
interference arises?
no
Check if float switch is
in good condition with
multimeter
no
Replace indoor PCB
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
Replace indoor coil
sensor
yes
cleaning
yes
modify indoor
motor or fan
capacitor
yes
indoor PCB failure
clean the drain pipe
yes
and water pump
no
replace pump motor
yes
clean drain pan
yes
Adjust bracket
yes
Replace float switch
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