Common Troubles In Refrigerators And Their Remedies - Haier HRF-660S Service Manual

SERVICE MANUAL
Model:HRF-660S

8-2 Common Troubles in Refrigerators and Their Remedies

Causes for troubles occurring in refrigerators are closely related to the quality of components and
workmanship in assembling by manufacturers as whether refrigerators are properly used and
maintained .The parameters generally used to express the working conditions of a refrigerator
include the temperature inside the refrigerator ,operation rate ,electric power consumption ,noise
level ,and other 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 freezer 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 refrigerator .
f) Check refrigerator door seal, case, 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.
Issue 201001
Rev.
Ref1001S008V0
26