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i) Control system is probably out of order
ii) The control system works normally but there are problems in the refrigerating
system or other parts
a) Temperature is set improperly
i) The temperature control knob is set to the “coldest” position. This position is to be
used for fast freezing or continuous running, its temperature for power off is too low,
therefore, the compressor will not stop and the temperature in the refrigerator
becomes lower and lower.
ii) Inspection method: check the temperature control knob to see whether it is set in the
position “coldest”.
b) Thermostat is malfunctioning and makes the compressor running continuously
Analysis of Trouble
When the thermostat does not work normally, it will make the compressor run
continuously, and hence very low temperature will be achieved in the refrigerator. The
fault is generally because the contacts of the thermostat cannot be released.
Remedy
Dismantle the thermostat and make a through checkup. If it is totally out of functioning,
replace with a new one.
c) Evaporation temperature is too high in refrigerating system, resulting in lower
refrigerating
capacity and hence continuous running of compressor
Analysis of Trouble
Leakage of refrigerant and clogging in a refrigerating system will directly affect its
refrigerating capacity. Due to the reduction in its refrigerating capacity, the refrigerator
temperature cannot reach its rated value. The thermostat will not work, thus the
compressor runs continuously. When the evaporation temperature in the system is too
high, the temperature sensing agent in the temperature sensor is also hotter therefore,
the thermostat is unable to cut off the power supply to the compressor and stop it.
Remedy
If it has been found that the refrigerant in the system is insufficient in quantity, recharge it
with refrigerant. In case clogging occurs, disassemble the part where it is blocked. If the
evaporation temperature is too high, settle this problem with an appropriate quantity of
refrigerant.
d) No stoppage of compressor due to damaged heat-insulation layer inside case body
and / or door seal
