11. Common faults and troubleshooting
Faults
Probable cause
Diagnosis method
Troubleshooting
abnormal voltage
check if the power matches the
stated standard
Adjust the capacity of mains power supply,
voltage and output
contacter fault
check the coils of contacter
if they are burnt out
Replace the contacter
thermostat
malfunction
adjust the thermostat to the
lowest and check if contact can
be connected
replace it in case of disconnection; or
adjust its accuracy in case of connection
overheat protector
burnout
check if it can be connected
replace it in case of disconnection
capacitor aging
check if capacitor has electro
-discharging ability
replace the capacitor
Program error
on control panel
observe the display panel for
the error codes
replace it after cause clarification
condenser dirts
check the dirts in the inner copper
tube of condenser
clean the condenser
incondensable air
in system
check if outlet temperature and
pressure is normal
refill the refrigerant after
vacuumization
condenser fan' filter
mesh dirt blockage
check if the filter mesh is
clogged
clean the filter mesh
condenser fan
no startup
check if the fan(capacitor)
is burnt out
replace the capacitor
Refrigerant leakage system leakage inspection
test and mend the leakage, pressurize and
vacuumize it and contact manufacturer for
commissioning it after refrigerant refilling.
dirt blockage
check if the filter dryer is iced up
replace filter dryer, pressurize and
vacuumize it and contact manufacturer for
commissioning it after refrigerant refilling.
breaker malfunction
(wrong use)
check if the breaker is too small
in fuse capacity
The capacity of breaker selected should
be 1.5 of AC working current
compressor
malfunction
check if the insulation of
compressor coils and earthing
are damaged
compressor fan
malfunction
evaporator fan
malfunction
check if the insulation of fan
and earthing are damaged
condenser fan filter
mesh dirt blockage
check if the filter mesh is clogged
clean the filter mesh
system leakage
1
.
test
the
leakage
2
.
measure
the
current
Contact the manufacturer
system dirt
blockage
check if the filter dryer is iced up
replace filter dryer, pressurize and
vacuumize it and contact manufacturer for
commissioning it after refrigerant refilling.
Contact the manufactuer
Weak cooling
air switch
tripping
after AC
startup
Compressor
not working
System
high pressure
alarm
Compressor
+2 fans working
but not cooling
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