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Evacuate and recharge
yes
Is system overfed? Is there air in system?
Is reading of discharging pipe pressure
g
au
ge oscillatory?
cleaning
yes
no
Is filter or heat exchanger dirty?
yes
Check fan motor
or indoor EEV
if outdoor fan motor work properly during cooling
cycle? and if indoor fan motor and indoor EEV
work properly during heating cycle?
no
Repair or
replacement
yes
Open stop valve
Is piping twisted or deformed?
no
Are stop valves in suction
pipe and liquid pipe of
outdoor unit open?
yes
yes
Replace high side pressure switch
no
Is pressure value detected by
pressure gage above 3MPa?
no
Is high pressure switch activated?
Check and reconnect
yes
yes
Are connectors of CN16 pressure switch
in good condition?
7. High pressure overhigh protection: 13 flashes of outdoor alarm lamp.
When high pressure switch is activated: Pressure is above 3.0 MPa.
no
no
replace PCB
-175-
Summary of Contents for H-MRV AF092FCBHA
Page 121: ... _ VbTZR Zb _ UZdZ_ Vb AU242FHBHA PCB top layer printed diagram 121 ...
Page 122: ... _ VbTZR Zb _ UZdZ_ Vb AU242FHBHA PCB bottom layer printed diagram 122 ...
Page 127: ... _ VbTZR Zb _ UZdZ_ Vb AU482FIBHA high voltage PCB printed diagram 127 ...
Page 131: ... _ VbTZR Zb _ UZdZ_ Vb AU482FIBHA low voltage PCB printed diagram 131 ...
Page 152: ... a__WcU S c a V e a Wc AB092 182FCBHA PCB printed diagram 152 ...
Page 156: ... a__WcU S c a V e a Wc AE FCBKA PCB printed diagram 156 ...
Page 199: ...MEMO Commercial Air Conditioner ...