>a__WcU[S^ <[c >a`V[e[a`Wc
replace PCB
no
no
7. High pressure overhigh protection: 12 flashes of outdoor LED302 When is high pressure switch
activated: Pressure is above 3.0 MPa.
Are connectors of CN318 pressure
switch in good condition?
yes
yes
Check and reconnect
Is high pressure switch activated?
no
Is pressure value detected by
pressure gage above 3MPa?
no
Replace high pressure switch
yes
yes
Are stop valves in suction
pipe and liquid pipe of
outdoor unit open?
no
Is piping twisted or deformed?
Open stop valve
yes
Repair or
replacement
no
if outdoor fan motor work properly during cooling
cycle? and if indoor fan motor and indoor EEV
work properly during heating cycle?
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
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