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Maintenance Service and Trouble Shooting   

6 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 dome stic 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)   

layer .   

Check refrigerator door seal ,case ,table surface and heat insulation   

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   

 

15 

 

Summary of Contents for L200CFW14

Page 1: ...Refrigerator Service Manual Models L200CFW14 Features Energy efficiency Micro foam technology Low noise operation Thick insulation for energy efficiency Latest No 2 micro biological technology 0...

Page 2: ...code illumination and Series Introduction 2 3 Specifications 3 4 Safety precautions 4 5 Function Schedule 7 6 System Flow Chart 8 7 Circuit Diagram 9 8 Maintenance Service and Trouble Shooting 10 9 E...

Page 3: ...CFW14 198 Color White Power Supply V Hz 220 240V 50HZ Rated Input Power W 90 Power Consumption kW h Y 219 Net Weight kg 35 Gross Weight kg Unit Dimension D W H mm Packing Dimension D W H mm Container...

Page 4: ...Safety precautions Safety precautions 4...

Page 5: ...Safety precautions 5...

Page 6: ...Safety precautions 6...

Page 7: ...Function Schedule Function Schedule Energy efficiency Micro foam technology Low noise operation Thick insulation for energy efficiency 7...

Page 8: ...System Flow Chart System Flow Chart 1 Schematic diagram of System Flow Chart Flows in the sequence 1 2 3 4 5 1 8...

Page 9: ...Circuit Diagram Circuit Diagram 1 Schematic Circuit Diagram 9...

Page 10: ...ower NO Check and repair according to the section of the compessor doesn t work YES If compressor can run naturally and temperature raising of condenser is very low YES NO Refrigerant leak check and r...

Page 11: ...capacity insufficient NO Check and repair according to the section of Cooling capacity is insuffcient YES 1 The thermostat was set at the coldest position 2 The ambient temperature is very high or th...

Page 12: ...ing 3 Cooling capacity is insufficient Cooling capacity is insufficient Is the ambient YES temperature low than 16 C Check the therostat is correct YES NO Does the refrigerant leak siowly Adjust and i...

Page 13: ...he power source and power cord NO Repair YES YES Is the ambient temperature low than 16 YES Check the therostat is correct Adjust and instruct consumer how to use Does the control panel has 220V power...

Page 14: ...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 oft...

Page 15: ...efrigerator locations and natures of troubles should be determined according to their respective features therefore experience in servicing is very important to troubleshooting Service technicians wit...

Page 16: ...d by a sound similar to water flowing this is the sound produced by the normal circulation of refrigerant within the evaporator In case only the gas flowing sound can be heard and there is no water fl...

Page 17: ...y 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 ca...

Page 18: ...essive refrigerant has been charged the liquid refrigerant that cannot evaporates in the evaporator will return to the compressor and thus a phenomenon of liquid striking will occur The liquid refrige...

Page 19: ...ator regularly if you fail to do so the frost layer on the evaporator tubing will become thicker and thicker Heat conduction will be severely affected when the whole tubing is wrapped with a transpare...

Page 20: ...rant and seal the charging port B No Refrigerating The phenomenon that the compressor runs normally but no frost or only a little frost appears on the evaporator and the refrigerator temperature does...

Page 21: ...t these phenomena will appear intermittently sometimes the refrigerator works well and sometimes not well In order to determine whether it is clogged with ice heat the suspicious points with hot water...

Page 22: ...gging with dirt 3 Troubles of Compressor a Breakage of gas suction and discharge valve blocks Analysis of Trouble The compressor works by means of the opening and closing of gas suction valve and disc...

Page 23: ...he system Analysis of Trouble The residual air in the system will circulate together with the refrigerant in the system The major symptoms caused by this residual air is higher gas discharge pressure...

Page 24: ...er supply c Abnormal thermal protection Analysis of Trouble The compressor current is within its normal range but the thermal protector actuates repeatedly Remedy Replace the thermal protector with a...

Page 25: ...he user for buying a stabilizer so as to step up the voltage thus normal operation can be achieved 3 Check the thermal relay to see whether its contacts are closed Analysis of Trouble The contacts of...

Page 26: ...caused mostly by poor lubrication such ad insufficient quantity of lubricant clogging in the lubricant oil line or intermittent lubricant oil supply Dirt and other impurities in the lubricant oil will...

Page 27: ...rated value the thermostat won t work thus the compressor runs continuously When the evaporation temperature in the system is too high the temperature sensing agent in the temperature sensor is also h...

Page 28: ...up intensively measure the resistance between the power cord plug and the case body with an avometer the reading will be zero 0 in the worst case the fuse will be blown Check the 3 prong outlet to se...

Page 29: ...tion becomes weake or vanishes If the refrigerator has not been levelly placed put a level meter on its top table and adjust the leveling screws on its legs In case noise occurs from the compressor st...

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