High Pressure Overhigh Protection - Haier H-MRV Series Service Manual

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
Is high pressure switch activated?
yes
Is pressure value detected by
pressure gage above 3MPa?
yes
Are stop valves in suction
pipe and liquid pipe of
outdoor unit open?
yes
Is piping twisted or deformed?
no
if outdoor fan motor work properly during cooling
cycle? and if indoor fan motor and indoor EEV
work properly during heating cycle?
yes
Is filter or heat exchanger dirty?
no
Is system overfed? Is there air in system?
Is reading of discharging pipe pressure
gauge oscillatory?
yes
Evacuate and recharge
no
Check and reconnect
Firstly, check if high pressure switch circuit
no
has a problem, such as short-circuit,
damaged component. Replace mainboard
when necessary
no
Replace high side pressure switch
no
Open stop valve
yes
Repair or
replacement
no
Check fan motor
or indoor EEV
yes
cleaning
-168-
>a__WcU[S^ <[c >a`V[e[a`Wc