SERVICE MANUAL
Model: HRF-663ISB2
26
Issue
2010-01
Rev.
Ref1001S015V0
Chapter 8 Trouble shooting
8-1. Normal phenomena
In a domestic refrigerator, there is not only a complicated electric control system, but also a
refrigerating system that is difficult to discern whether it is in a good working condition. Both the
systems are related and affect each other. If a certain part of a refrigerator works abnormally .Its
refrigerating efficiency will decrease, operation properties will become unstable, or even it cannot be
used normally for those serious cases.
Refrigerators are generally of larger volume, once troubles appear, to send them to a service
department is really a tough thing, if such is the case, the user will always be in suspense, sometimes,
normal phenomena will be erroneously regarded as troubles .Therefore ,before we deal with the
topics of frequently occurring troubles of refrigerators and their remedies ,we should firstly give a
brief account of some normal phenomena which are not troubles .In case any one of such
phenomena occurs ,there is no need to worry about it ,and the user can use it at total ease .
1).When the compressor of a refrigerator has just stopped running, a rumbling sound can be
heard from inside its evaporator .This is a sound caused by the flowing of refrigerant in the
evaporator tubing .Because the pressure difference is still greater after the compressor has just
stopped running, the refrigerant will flow for a certain time, therefore, this sound is a normal
phenomenon.
2).A click sound can often be heard from the refrigerator .This is a normal sound produced by the
pull-in or release of the armature of a current deadweight start relay when starting the compressor.
The compressor motor will produce a slight and uniform sound while it is running .This sound is not
easy to be heard in the daytime, but of course it can be heard distinctly at night.
3).The compressor consists of an electric motor and a compressing apparatus .During its normal
operation, the motor’s stator core and windings will rise to a temperature in the range of 100 ~110,
and the temperature of the piston and cylinder of the compressing mechanism can also reach as
above 100 due to the heat produced when compressing refrigerant .Most of the heat radiates to the
air through the compressor casing, therefore, its casing is generally at a temperature between 85 ~90,
it is very hot ,particularly in summer when the ambient temperature is higher .All these are normal
phenomena .
4).For the direct cooling refrigerator ,a kind of irregular crack sound can be often heard when the
compressor is running for a certain period of time or has just stopped its running .This sound is
caused by the stress relief due to expansion and contraction when temperature changes ,and will not
affect the normal application of refrigerator .
