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Improper set of temperature
Adjust set temperature
If cooling (heating) load is proper
Check the forecasted load of cooling (heating)
Malfunction of four-way valve
The secondary refrigerant has leak-
age or is insufficient
Replace the four-way valve
Poor COOL(HEA
T)
operation
Malfunction of
refrigerant flow
Replace the compressor
Leakage between the high pressure and
the low pressure inside the compressor
Replace the capillary
Local block of capillary
Judge whether the system is blocked by observing the
condensation of evaporator and the pressure value of the
high pressure manometer and take measures to deal with
the system.
Check and fill the leakage, then vacuumize it
and supplement the refrigerant as required
Blockage of cooling system
Heat insulation for the connection pipes of
the indoor unit and the outdoor unit is bad.
Make sure that heat insulation for the thick and thin pipes is
good. Heat insulation must also be provided for the joint and
the exposed part of the copper pipe .
Block of outdoor heat exchanger
Air filter were blocked
Clean the filter
Air circulation
is insufficient
Fan rotation speed becomes
low
Fan speed was set too slow
To set the fan speed to high or middle speed
Clean the dust accumulated on the surface
of the heat exchanger.
Motor damage
Capacitor damage
The installation position of the out-
door unit is not appropriate.
The air tightness is not enough. People come
in and out too frequently. There are heat-
ing devices indoors.
Keep certain air tightness indoors, try not to use
electrical appliance with large quantity of heat
The outdoor temperature is too high.
Properly install the rainproof plate or the sunproof plate. If the
maximum cool air still can not meet the requirement, it is suggested
to replace the air conditioner.
Good ventilation must be provided for the
installation position of the outdoor unit.
Replace the capacitor
Replace the motor
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