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Maintenance Service and Troubleshooting
2b. Overload of electric motor
Analysis of Problem
The motor might stop running if:
i. too many items are placed inside the refrigerator, which will cause
the thermal load to exceed its refrigerating capacity, or
ii. The power supply voltage drops considerably, causing the current
flowing through the motor to increase drastically, activating the
thermal protector and blowing a fuse. If the motor is still running, its
windings will be burned out.
Solution
Reduce the thermal load, paying close attention to the variation in the power
supply voltage.
2c. Abnormal thermal protection
Analysis of Problem
The compressor current is within its normal range, but the thermal protector
activates repeatedly.
Solution
Replace the thermal protector with a new one.
3. Blockage due to other causes
Normal Stoppage
A thermostat generally controls when the compressor starts and stops. When
the temperature in the refrigerator reaches its desired value, the thermostat will
shut down the compressor automatically. Never confusion this normal operation
as a malfunction. Be sure to differentiate this normal occurrence from real issues
while servicing.
D. Compressor Will Not Start
If the compressor does not start, find the root of the problem by conducting
a step-by-step checkup. There are many possible causes, including electrical
and mechanical.
1. Check if power supply is connected to the compressor circuit
Analysis of Problem
If the compressor will not start, usually the problem will manifest itself in the
power supply circuit, such as power failure, poor switch contact, or blown fuse.
Make a comprehensive analysis of the situation, find the cause, and take
measures to fix the problem.
Solution
a. Check the power circuit input—connected to the light switch—to see if
there is voltage in the power supply. This can be determined with a
voltmeter or a test pencil. If a blown fuse is found, determine and remove
its cause, and replace it with a new one with the same specifications.
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