Gree FGR25Pd/DNa-X Service Manual page 98

Duct type split Air conditioner Inverter Series
Low pressure
protection
NO
Measure whether the low pressure
is too low with manometer
yes
YES
Check whether the refrigerant-
charging volume is insufficient
NO
Check whether gas valve and liquid
valve are open completely
YES
NO
Check whether the panel of
outdoor unit is covered and sealed
well
YES
NO
Check whether the air can blow
smoothly at the heat exchanger of
indoor unit and outdoor unit
YES
NO
Check whether the indoor fan
and outdoor fan can operate
YES
NO
Check whether the indoor swing
blade is open completely
YES
NO
Check whether the electronic
expansive value for indoor unit and
outdoor unit can operate normally
YES
NO
Blockage for
system pipeline
Measure
whether the
pressure switch
is normal
Charge refrigerant according to the volume
on nameplate; check whether there is
leakage for the system
NO
Open the valve
completely
Cover the panel
of outdoor unit
well
Eliminate obstacles and
sundries
Measure the
circumstances of fan
motor and signal input
Measure the
circumstances of swing
motor and signal input
Engage valve and
coil
Mainly check the air inlet and air outlet
connecting indoor unit and main pipe, and the
expansive valve for indoor unit and outdoor unit.
Replace electronic expansion valve, dry
96
YES
Replace main
board of outdoor
unit
NO
Replace
pressure switch
strainer,ect.