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2. COMMON PROBLEMS OF A REFRIGERATOR AND THEIR SOLUTIONS
Refrigerator problems are closely related to the quality of components, level of
workmanship, and owner maintenance. The parameters generally used to determine the
working conditions of a refrigerator include the temperature inside the refrigerator, the
operating rate, electrical power consumption, noise level, and other functional indices. If
any of these indices passes their permissible range, there is a fault with the refrigerator.
During the entire service life of a refrigerator, the probability of problems occurring within a
specific time is called its failure rate. A comparison between the control circuit system of a
refrigerator and its refrigerating system indicates that the failure rate of the former is higher.
When troubleshooting, the first thing you must do is to determine whether the source of the
problem is the control system or the refrigerating system.
There is usually no troubleshooting instrument for the domestic refrigerator. The location
and nature of problems must therefore be determined according to their respective
features. Experience in servicing is very important for troubleshooting. Well-experienced
service technicians can correctly identify and solve problems based on their comprehensive
analysis of the characteristics of the particular problems as well as the operating conditions
for various kinds of refrigerators.
• Three Essential Things To Note During A Checkup
Look
a) Check the tubing of the refrigerating system for cracks and various welding points for
leakages. If there is a leakage, a distinct oil stain will be seen.
b) Check the suction and exhaust pressure valves of the compressor to see whether they
are normal.
c) Pay attention to the rate at which the temperature decreases in both the refrigerator and
freezer compartments.
d) Check the environment to see whether it is suitable for the refrigerator.
e) Check refrigerator door seal, case, table surface, and heat insulation layer.
Listen
a) Listen to the noises made while the compressor is running. During the normal operation
of compressor, a slight and uniform humming sound due to undulation of electric
currents will be heard. The sounds listed below indicate a malfunction.
i. Humming sounds from a fully enclosed aggregate unit indicate that the motor was
not started properly.
ii. Clattering sounds from the start relay indicate that the start contacts cannot be
released normally.