Haier AC122ACERA [372/408] Troubleshooting

Haier AD122ALERA [372/408] Troubleshooting
measure actual pressure by a
pressure gauge to adjust the
output failure
Lack of refrigerant, charge
additional refrigerant and check if
piping leaks, if yes, replace piping
check if high
pressure is low,too
yes
check if piping is blocked
dredge piping
yes
replace pressure
switch
low pressure
abnormal
no
yes
outdoor indicator flashes 19 times
Re-electrified after power off,
check if compressor can start
up normally
when compressor starting up,
unit stops abnormally and
can not start up normally
yes
no
eliminate other troubles
no
check if the wiring between
outdoor PCB and module is
correct
compressor not start up, outdoor
alarms, check if there is other
failure
outdoor indicator flashes 22 times
yes
no
no
eliminate other failures
replace PCB
yes
if problem is solved
no
outdoor indicator flashes 24 times
10) Running state detecting abnormal
Alarm condition: when compressor is running, the unit will be abnormal or stop.
replace compressor
11) Communication failure between outdoor PCB and module
adjust wiring
replace module
12) Outdoor low pressure abnormal
Alarm condition: outdoor system pressure is lower than 0.05MPa.
no
Troubleshooting
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