Haier H-MRV Series Service Manual page 185

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