Haier AU48NFIERA Installation Instructions - Page 67
pressure, protection
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7 . Low pressure too low protection Are connectors of CN317pressure switch in good condition? yes Is low side pressure switch activated? yes no Check and reconnect no Replace PCB Is pressure valve detected by pressure gauge lower than 0.05MPa? no Replace low pressure switch yes If outdoor stop valves of gas pipe no and liquid pipe are open totally 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 yes Cleaning If refrigerant circuit is leak? or lack of refrigerant? yes Check leakage point, evacuate and recharge 67
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Are connectors of
CN317
pressure switch
in good
condition?
yes
Is low side pressure switch activated?
yes
Check and reconnect
Replace PCB
no
Is pressure valve detected by
pressure g
au
ge 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
no
7
. Low
pressure
too low
protection
67