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SERVICE MANUAL
Model: HRF10WNDWW/HRF12WNDWW
23
Issue 2009-7-24
Rev. Ref0907S005V0
3) Sudden stoppage due to other causes
Normal Stoppage
Start and stop of the compressor is generally controlled by a thermostat. When the temperature in the
refrigerator reaches its desired value, the thermostat will shut down the compressor automatically.
Never take this normal operation as a trouble; care should be taken to differentiate it from other real
troubles in servicing.
7-3-2. Compressor won’t start
In case the compressor cannot be started, you must find out the origins of this trouble through checkup
step by step, because probably there are many causes, including those electrical and mechanical.
1) 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, fine out its real cause and take correct measures to remove this trouble.
Remedy
a) Check the input power circuit to see whether where is voltage of the power supply, namely, the
circuit which is connected to the knife switch. This can be determined with an avometer 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.
b) 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.
c) 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.
2) 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
