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Set
temperature
appropriate
Check if the cooling (heating)
load is appropriate
Leakage of refrigerant or
insufficient refrigerant
Leakage between internal
high
pressure
compressor
Failure of
4-way valve failure
refrigerant flow
Partial block in capillary
Block in cooling system
Poor thermal insulation of connecting
pipe between indoor unit and outdoor
unit
Insufficient air
circulation volume
Outdoor temperature
is too high
Indoor space is not sufficiently closed, or
people enters or leave the room frequently, or
there is heating equipment operating in the
room
is
not
Adjust the set temperature
Check the forecasted cooling (heating) load
pressure
and
low
sections
of
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
Block in outdoor heat
exchanger
Block in air filter
Fan speed was set too
low
Fan
speed
turns
lower
Mounting position of
outdoor
unit
is
inappropriate
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
－46－
Check
leakage,
vacuum-pumping
leakage
and
charge
according to requirements
Replace compressor
Replace 4-way valve
Replace capillary
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
Wash away dust on surface
of heat exchanger
Clean filter
Set fan speed as high or medium
Capacitor
is damaged
Motor is
damaged
Outdoor unit shall be installed in a
place with good ventilation
Keep the indoor space as closed as
possible, do not use electrical appliance
generating large amount of heat
carry
out
after
repairing
refrigerant
Replace
capcitor
Replace
motor
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