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Trouble-Shooting
Air –conditioning unit
cannot be started
Check if the set
Poor cooling
temperature is
appropriate
Check if the cooling
load is appropriate
failure in flow
of refrigerant
Insufficient
air circulation
volume
Poor thermal insulation of
refrigerant connecting pipe
between outdoor unit and
indoor unit
Trip of circuit
breaker or
burn-out of
fuse
Both indoor
unit and
outdoor unit do
not start
Decrease upper
point set
temperature
Check the
forecasted
cooling load
Replace
4-way value
4-way valve
failure
Insufficient
refrigerant
refrigerant
Replace
Compressor
Compressor
failure
Fully open
Insufficient flow
the valve
through pipeline
valve
Clean the
Block in air filter
filter grill
Set fan speed
Check if the fan
as high or
speed is set too
low
Big pipe and small
pipe shall have
separate thermal
insulation
When set short-circuiter
as ON , it trips
immediately
When turning the air-conditioning unit
to the
ON status, trip of circuit
breaker occurs several minutes later
No power supply
Emission failure of remote controller
Serial communication failure between
indoor unit and outdoor unit
Winding protection function of
compressor is activated
Open circuit of sensor or moderation
function is activated
Failure of switch assembly unit
Poor heating
failure in flow
of refrigerant
Charge
Small air
circulation
volume
medium
Poor thermal insulation of
refrigerant connecting pipe
between outdoor unit and
57
Check insulation resistance for
grounding; Confirm if
air-conditioning unit has electrical
leakage or is short-circuited
Check circuit breaker,
measure resistance
Check power supply status
Check remote controller
Check if the set
temperature is
appropriate
Check if the heating
load is appropriate
4-way value
failure
Insufficient
refrigerant
Compressor
failure
Insufficient flow
through pipeline
valve
Block in air filter
Check if the fan
speed is set too
low
indoor unit
for short-circuit
Increase the set
temperature
Check the
forecasted
heating load
Replace
4-way valve
Charge
refrigerant
Replace
Compressor
Fully open
the valve
Clean the
filter grill
Increase fan
speed
Big pipe and small
pipe shall have
separate thermal
insulation
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