Haier HF-180T, Service Manual

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ambient temperature ,this means that most meshes of its screen has been 
clogged ,resulting in an obstructed flowing of refrigerant ,thus causing a 
drop in temperature due to throttling . 

d)  Feel the temperature of exhaust gas from the refrigerating 

system .the exhaust gas should be very hot and this is the normal working 
state .For those refrigerator with enclosed type of compressor refrigerating 
system, no frost or dew drop will from on the gas suction 
tube ,otherwise ,there is something wrong in the system (Frosting and dew 
condensation may appear for a very short time period when just starting the 
machine ,this is a normal phenomenon ). 

Because a refrigerator is a combination of several components ,they are 

related and have influence on each other .In case an abnormal 
phenomenon has been found through the above-mentioned checkups ,you 
need not to make a hasty conclusion based on only one abnormal 
phenomenon .It is advisable to find out two or more abnormal 
phenomenon ,or conduct troubleshooting comprehensively with the aid of 
instruments or other ways ,because several kinds of troubles may share a 
common abnormal phenomenon ,and two or more abnormal phenomena 
may occur simultaneously due to a certain trouble .With this method ,you 
can reject some suspicious troubles and finally make a correct judgment . 

7 Analysis of Troubles and Troubleshooting 

A. Poor 

Refrigerating 

Effect 

The so-called “poor refrigerating effect “ refers to the fact that the 

refrigerator can operate and refrigerator  normally ,but the temperature in 
the refrigerator cannot drop to the prescribed value under the stipulated 
working conditions .In view of there are many causes for this 
phenomenon ,we are going to discuss and analyze it in the following 7 
aspects : 

1) Leakage 

of 

refrigerant 

Analysis of Trouble 
The leakage of refrigerant in the system will result in an insufficient 

refrigerating capacity ,the resulting phenomena are its lower gas suction 
pressure and exhaust pressure as well as higher exhaust gas 
temperature .The exhaust tube feels rather hot ,and a continuous gas 
flowing sound louder than usual can be heard at the outlet of the 
capillary ,and no frost or a smaller quantity of loose frost appears on the 
evaporator .After shut down ,the balance pressure in the system is usually 
lower than the saturation pressure corresponding to the same ambient 
temperature . 

Remedy 
In case there is leakage of refrigerant from the system ,do not hurry to 

recharge it with refrigerant ,manage to find out leak points immediately ,and 
make a note of from where it leaks ---welding points and parts .After having 
them repaired ,recharge refrigerant . 

Maintenance Service and Trouble Shooting