Haier AU482FIERA Installation Manual - Page 72
High pressure overhigh protection
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6. High pressure overhigh protection Are connectors of pressure switch in good condition? yes Is high pressure switch activated? yes no Check and reconnect no replace PCB Is pressure value detected by pressure gauge above 3MPa? yes no Replace high pressure switch Are stop valves in suction pipe and liquid pipe of outdoor unit open? yes Is piping twisted or deformed? no no Open stop valve yes Repair or replacement if outdoor fan motor work properly during cooling cycle? and if indoor fan motor and indoor EEV work properly during heating cycle? no Check fan motor or indoor EEV yes Is filter or heat exchanger dirty? no yes cleaning Is system overfed? Is there air in system? Is reading of discharging pipe pressure gauge oscillatory? yes Evacuate and recharge 71
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