Maintenance Service and Trouble Shooting
functional indexes .If any one of these parameters is beyond its permissible range .this
indicates that there is a fault or trouble in the refrigerator.
During the whole service life of a refrigerator ,the probability of troubles occurring within
a union time is called its failure rate .Making a comparison between the control circuit
system of a refrigerator and its refrigerating system ,we can find that the failure rate of
the former is higher ,and that of the thermostat is the highest. In troubleshooting ,the
first thing you must do is to determine where the trouble comes from
— the control
system or the refrigerating system .There is general no trouble indicating instrument
mounted on the domestic refrigerator .locations and natures of troubles should be
determined according to their respective features .therefore .experience in servicing is
very important to troubleshooting .Service technicians with rich experience can correctly
locate them and take reasonable remedy measures based on their comprehensive
analysis of trouble characteristics as well as operating conditions for various kinds of
refrigerators .
Three Essentials for Checkup
1)
Look
a)Check the tubing of refrigerating system for cracks and various welding points for
leaks ;if leakage occurs ,an oil stain can be seen definitely .
b) Check the suction and exhaust pressure values (high pressure and low pressure) of
compressor to see whether they are normal.
c) Check the conditions of frost attached to its evaporator and gas return tube .It is
abnormal if frost has formed on part of the evaporator or there is no frost attached to it.
d) Pay attention to the speed of temperature drop inside wine storage compartment .It
is abnormal if the speed of temperature drop is obviously slower than the
corresponding normal speed.
e) Check the environment to see whether it is suitable for placing a wine cooler.
f) Check the door seal, case, and table surface and heat insulation layer.
g) Look at the main control board to ascertain if various indication states are normal.
2) Listen
a) Listen to the noises produced when the compressor is running
Hums from a fully enclosed aggregate unit is the sound caused by overload indicating
that the motor cannot be started normally. meanwhile ,a clattering sound can be heard
from inside the start relay ,which is produced because the start contacts cannot be
released normally .A whistling sound is caused by the high pressure gas flowing out of
the crack of the pressure tube inside the compressor ,and clucks are the sound of
striking after the suspended spring inside the compressor has broken .
During the normal operation of compressor, a slight and uniform hum sound due to
15