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Are connectors of CN317pressure switch
in good condition?
yes
Is low side pressure switch activated?
yes
Check and reconnect
Replace PCB
no
Is pressure valve detected by
pressure gauge lower than
0.05MPa?
no
Replace low pressure switch
yes
If outdoor stop valves of gas pipe
and liquid pipe are open totally
no
Open stop valve
yes
Is piping twisted or deformed?
no
Adjust and maintain
no
Do outdoor fan and PMV work
properly during cooling cycle? Do
indoor fan and EEV work
properly during heating cycle?
no
Repair fan motor and EEV
yes
If the filter and heat exchanger
are dirty
yes
Cleaning
yes
If refrigerant circuit is leak? or
lack of refrigerant?
yes
Check leakage point, evacuate
and recharge
8. Low pressure too low protection
no
Outdoor LED flashes 15 times. Low pressure is lower than 0.05MPa for 3 minutes; or lower than 0.05MPa for 30
seconds during halt time
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