No
frost
Compressor
Check the frost
on the cabinet
liner surface
Leakage
check
Cut off the
low preesure pipe
No refrigerant
air spurt out
Leakage
point ?
On the
pipe joint
Refrigerant
Leaks
Cut off the low pressure
pipe and spurt out the
residual refrigerant
Repair the welding,
clean the pipe and
replace the dry filter
Vacuuming and
recharging
Leakage
check again
Refrigerant
air spurt out
Cut off the high
pressure pipe
Normal suction of
the comressor low
pressure pipe
Charge the
nitrogen to the
condenser pipe
No air on the
low pressure side
Pipe
clogged
Replace the dirty and
clogged parts and
clean the system pipe
Little
frost
No air suction on
the compressor
low pressure pipe
Cut off the high
pressure pipe
Bad compression
of the compressor
Replace the
compressor
Leakage
checking
Detected
Leakage
point
?
Cut off the
low preesure pipe
A little
refrigerant air
spurt out
Leaks
slowly
A little
refrigerant air
spurt out
Repair the welding,
clean the pipe and
replace the dry filter
Vacuuming and
recharging
Leakage
check again
Big quantity
refrigerant air
spurt out
Cut off the high
pressure pipe
Normal suction of
the comressor low
pressure pipe
No air suction or weak
suction on the compressor
low pressure pipe
Compressor
breaks down
Replace the
compressor
Charge the
nitrogen to the
condenser pipe
Not sufficient nitrogen
air return back the low
pressure side
Pipe is
clogged
slightly
Replace the dirty and
clogged parts and
clean the system pipe
Condensate dew
but no frost
Check the high
pressure side pipe
and compressor
Too high
temperature
Check low
pressure pipe
Frost
Too more
refrigerant
Frost
Recharge appropriate
quantity refrigerant
Cooling
discontinuously
Pipe is clogged
with ice
Replace the dry filter
and clean the system
pipe with warm nitrogen
Compressor
not working
Check the electrical parts such
as PTC starter,capacitor,overload
protector, thermostat etc.
Broken-down
Replace the
broken-down parts
Good
Measure the
resistance of the
compressor winding
Abnormal
resistance
Normal
Replace the
compressor
Overload
protector acts
Over large
current
Replace the
compressor
Compressor
goes wrong
Yes
No
Problem and check point Cause Solution
