Indoor space is not sufficiently closed, or
people enters or leave the room frequently, or
there is heating equipment operating in the
room
Keep the indoor space as closed as
possible, do not use electrical appliance
generating large amount of heat
Outdoor temperature
is too high
Install proper weather screen; it is suggested to replace
air-conditioner unit with one of higher capacity in case the best
available cooling effect does not satisfy needs
Insufficient air
circulation volume
Block in outdoor heat
exchanger
Wash away dust on surface
of heat exchanger
Block in air filter
Clean filter
Fan speed was set too
lo
w
Set fan speed as high or medium
Fan speed turns
lower
Capacitor
is dama
ged
Replace
ca
pacitor
Motor is
damaged
Replace
moto
r
Mounting position of
outdoor unit is
inappropriate
Outdoor unit shall be installed in a
place with good ventilation
Poor thermal insulation of connecting
pipe between indoor unit and outdoor
unit
The thermal insulation of big pipe and small pipe
shall be separate and sound; joint and bare position
of copper pipe shall also have thermal insulation
Failure of
refrigerant flow
Leakage of refrigerant or
insufficient refrigerant
Check leakage, carry out
vacuum-pumping after repairing
leakage and charge refrigerant
according to requirements
Leakage between internal
high pressure and low
pressure sections of
compressor
Replace compressor
4-way valve failure
Replace 4-way valve
Partial block in capillary Replace capillary
Block in cooling system
Observe the condensation condition
of evaporator or the reading of high
pressure meter to judge if the system
is blocked; deal with the system
accordingly
Check if the cooling (heating)
load is appropriate
Check the forecasted cooling (heating) load
Set temperature is not
appropriate
Adjust the set temperature
Poor cooling (heating) effect
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