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Maintenance Service and Troubleshooting
4b. Faulty control relay
Analysis of Problem
Overheating, burnouts, and/or wearing of control relay contacts will generally
occur. All these will cause poor contact in electricity.
Solution
Dismantle the control relay to repair or replace it with a new one.
4c. Defective electric contactor in thermostat
Analysis of Problem
Damaged contactor and the temperature-sensing agent has leaked.
Solution
Replace the old/broken contactor with a new one.
4d. Check the terminals for loose connection and electrical circuits for other
abnormal occurrences.
5. Mechanical problems in compressor
Analysis of Problem
a. Shaft seizure: This is mainly caused by poor lubrication, such as
insufficient lubricant, clogged lubricant oil line, or irregular application of
lubricant. Dirt and other impurities in the lubricant will increase its
gumminess and cause the shaft to seize up. Copper plating may also
cause shaft seizure.
b. Piston seizure: This is caused when the fit clearance between the piston
and cylinder is too small or has expanded due to heat.
These problems have most likely happened if the refrigerator is turned on,
but the compressor will not start, while it emits a slight humming, and, seconds
later, the thermal protective relay activates and opens the contacts. This process
will occur repeatedly, and the compressor will remain inactive.
Solution
Replace compressor.
E. Compressor Will Not Stop
The compressor will run continuously for several hours or without end. There
are many reasons why this might happen.
1. Common Causes
a. Too much food is placed or is too densely packed in the refrigerator,
resulting in poor ventilation or inadequate conditions for temperature
sensing.
b. The ambient temperature is too high, creating poor ventilation and heat
dissipation.
c. The control system is out of order.
d. Control system functions normally, but there is an issue in the
refrigeration system.
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