Haier AD182ALERA Service Manual page 39

4) High pressure protection
Confirm the fault according
to the fault code list
yes
Are connectors of pressure switch in good
condition?
yes
Is high side pressure switch
activated? (If not, DC voltage is 0V.)
yes
Is the high side pressure detected by
the gage higher than threshold
value? The threshold value is
indicated on the switch
yes
if outdoor stop valves of gas pipe
and liquid pipe are open totally
yes
Is piping twisted or deformed?
no
Does indoor fan work properly during
cooling cycle? Does outdoor fan work
properly during heating cycle?
yes
Is indoor filter or heat
exchanger dirty?
no
Check if system is overfed according
to equalized pressure in halt.
no
Is reading of discharging pressure
gage oscillatory?
yes
There is air in system.
Evacuate and recharge
Commercial Air Conditioner
no
Check and reconnect
no
Replace PCB
Replace high pressure
no
switch
no
Open the valves
yes
Repair pipe
no
Repair fan motor or fan
capacitor
yes
Cleaning
yes
Evacuate and recharge
Bad operation codition, such as ultra low
no
outdoor temperature
Model: AD182ALERA AD362AHERA
39