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no
no
7. High pressure overhigh protection: 13 flashes of outdoor alarm lamp.
When high pressure switch is activated: Pressure is above 3.0 MPa.
Are connectors of CN16 pressure switch
in good condition?
yes
yes
Check and reconnect
Is high pressure switch activated?
Firstly, check if high pressure switch circuit
has a problem, such as short-circuit,
damaged component. Replace mainboard
when necessary
no
Is pressure value detected by
pressure gage above 3MPa?
no
Replace high side 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
-168-
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