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yes
if outdoor stop valves of gas pipe
and liquid pipe are open totally
Open the valves
no
Is indoor filter or heat
exchanger dirty?
Cleaning
yes
yes
Repair fan motor or fan
capacitor
no
no
Repair pipe
yes
Is piping twisted or deformed?
yes
Does indoor fan work properly during
cooling cycle? Does outdoor fan work
properly during heating cycle?
no
Check if system is overfed according
to equalized pressure in halt.
yes
Evacuate and recharge
no
Is reading of discharging pressure
gage oscillatory?
no
Bad operation codition, such as ultra low
outdoor temperature
yes
There is air in system.
Evacuate and recharge
4) High pressure protection - Wired controller shows 53
Confirm the fault according
to the fault code list
yes
Check and reconnect
no
Are connectors of pressure switch in good
condition?
Is high side pressure switch
activated? (If not, DC voltage is 0V.)
yes
Replace PCB
no
Is the high side pressure detected by
the gage higher than threshold
value? The threshold value is
indicated on the switch
yes
Replace high pressure
switch
no
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