Haier HB21FNN, Руководство по обслуживанию

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Troubleshooting and Repair
1. Normal Phenomena—Not Troubles for Refrigerators
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
ć
~110
ć
,
and the temperature of the piston and cylinder of the compressing
mechanism can also reach as above
100
ć
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
ć
~90
ć ,it is very hot ,particularly in summer
when the ambient temperature is higher .All these are normal phenomena .
4). For the forced air 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.
The stress relief due to expansion and contraction causes this sound when temperature
changes, and will not affect the normal application of refrigerator.
2. Common Troubles in Refrigerators and Their Remedies
TROUBLESHOOTING