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The effi ciency of the compressor is low
Whether the cooling (heating) load is suitable
Refrigeration system is blocked
Refrigerant is insuffi cient or leaking
Condenser can’t discharge smoothly
The air tightness in room is not good. People
come in and go out frequently. There are
heating devices in the room when A/C is cooling
The fan’s capacitor is broken
The controller has malfunction
The compressor’s motor is burned out
Supply voltage is unstable
Too much refrigerant
Outdoor temperature is too high
At the time of heating, the electric heater
can’t run
Compressor
isn’t running
(controller is
with output)
Call for fan
motor but fan
motor will not
come on
A/C on. No
cooling (or
heating)
The motor winding is of broken circuit or short
circuit or the built in temperature limiter device
in open circuit due to overheat.
Wrong wire connection
The compressor capacitor is broken; wrong wire
connection
The compressor is jammed or blocked
Check leakage, carry out vacuum-pumping after repairing
leakage and charge refrigerant according to requirements
You can install the rain-proof and sun-proof board. If the
cooling air is still insuffi cient, you are suggested
to replace the A/C
1. the wire is loosened; 2. thermal fuse is broken;
3. temperature limiter is damaged; 4. electric heater is
damaged; 5. controller is broken. correct the wore correctly
or replace those parts which has malfunction.
Replace fan’s capacitor with the same
mode and specifi cation
Check the circuit and connect the wire correctly
according to the electic circuit diagram
Replace the controller
Keep the air tightness well. Try not to use the electic
appliances with a large quantity of heat
Check with a multimeter if the enclosed motor windings of
compressor is with short or broken circuit or earthing. If so, it
is needed to replace it with the same type and specifi cations.
Knock the compressor housing with a rubber bar or with
a hammer padding with a wood, the compressor might be
shocked and run. If not, change the compressor.
Check whether the system is blocked by observing the
condensation of the evaporator and the pressure value of
the high pressure manometer, and then take measures to
deal with the system.
Check the preset cooling (heating) load
Check the reason and correct it.
Replace those parts which has malfunction
Replace capacitor; connect the wire correctly
according to the electric circuit diagram
Get rid of the obstacle
Replace the compressor
Release the redundant refrigerant in system