Haier 102102429 Service Manual - page 16

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5  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℃~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 . 

Maintenance Service and Trouble Shooting