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Maintenance Service and Troubleshooting
instruments or other ways, because several issues may share a common
source and several problems may occur simultaneously due to a specific
reason. With this method, some suspicious issues can be eliminated and
a correct judgment can be reached.
7. Analysis of Problems and Troubleshooting
A. Poor Refrigerating Effect
The so-called "poor refrigerating effect” refers to when the refrigerator
operates normally, but it does not cool down to the temperature indicated by the
thermostat. Possible causes for this occurrence are discussed and analyzed
below:
1. Refrigerant Leaks
Analysis of Problem
Refrigerant leakage will result in an insufficient refrigerating capacity, which
will lower the gas suction and exhaust pressures and increase the exhaust gas
temperature. The exhaust tube will be rather hot, and a continuous gas-flowing
sound from the outlet of the capillary will be louder than normal. Little to no frost
will appear on the evaporator. After shutting down, the balance pressure in the
system is lower than the saturation pressure corresponding to the ambient
temperature.
Solution
If there is a refrigerant leak, do not rush to recharge it with refrigerant. Since
there are many joints and sealed surfaces in a refrigerator, there are numerous
potential leak points. Therefore, locate the point(s) of leakage and note from
where it leaks. After repairing, recharge refrigerant. In troubleshooting, pay
attention to those parts that are prone to leak, checking main connection points
for oil seepage and tubing for cracks. If there is no severe leak, charge the
system with nitrogen to detect leak points. Once the leak is found, repair it, empty
the system, charge with refrigerant, and turn on the refrigerator for a test run.
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