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In case the compressor cannot be started, you must find out the origins of this trouble
through systematic checkup, because probably there are many causes, including the
electrical and mechanical parts.
a) Inspect the power supply to see whether it is connected to the compressor circuit.
Analysis of Trouble
In case the compressor cannot be started, this will generally exhibit in the power supply
circuit, for instance, power failure, poor contact of switch, and blown fuse. Make a
comprehensive analysis of these phenomena, find out its real cause and take corrective
measures to resolve the problem.
Remedy
i) Check the input power circuit to see whether there is voltage in the power supply, note:
the circuit that is connected to the knife switch. This can be determined with a voltmeter
or a test pencil. If a blown fuse is found, ascertain and remove its cause, then replace it
with a new one of the same specifications.
ii) Check the compressor accessories, including its thermal protector and relay. In case
the thermal protector is damaged, the compressor cannot be powered on. If the relay is
out of order, the motor will not run and hum sound can be heard from it after the
compressor is turned on. In that case, shut it down immediately, otherwise, the motor
windings will be burned out in case this condition lasts longer.
iii) Check the relay contacts and plugs to see if they are perfect and work reliably. Poor
contact may cause the motor not running or humming.
b) Check the circuit voltage to see whether it is normal
Analysis of trouble
If the circuit voltage is obviously lower than its rated value, it will be difficult to start the
motor, and a hum sound can be heard from it.
Remedy
Measure the voltage with a voltmeter; if it is really too low, give directions to the user for
buying a stabilizer to step up the voltage, thus normal operation can be achieved.
c) Check the thermal relay to see whether its contacts are closed.
Analysis of Trouble
The contacts of thermal relay sometimes may be open due to the leakage of temperature
sensing agent from the temperature sensor.
Remedy
Remove the relay cover to check up its contacts. If they are open, this means that the
original setting is not properly set or temperature-sensing agent has leaked out of the