Haier Hrf 369aa Service Manual

							10  Circuit Diagram  Circuit Diagram   
						

							1  Program Diagram 
 Start T>Ts Read T Stop Read T  T>Ts Ts+Td>t>Ts Ts+Td+2t>T>Ts+Td+t Ts+Td+2t>T>Ts+Td+t Ts+Td+mt>T>Ts+Td+(m-1)t N=Nmax  Ts+Td>t>Ts Ts+Td+t>T>Ts+Td N=Nmax Y Y N Stop N>N2 N>N3 N=N1 N=Nmax-1 N>N4 N=N2 N=N3 N>Nmax-1 T  ---- Factual Temperature 
Ts ----- Enactment Temperature 
Td----- No~Off Extent 
t ------ Temperature Increment 
N-----  Compressor Rotate Speed N1< N2< N3< ……..< Nmax  Program Diagram   
						

							2   
Maintenance Service and Trouble Shooting 
 
1 No cooling 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Maintenance Service and Trouble Shooting Block by ice or dirty 
things,change filter and change 
refrigerant again.YES
   If compressor
can run naturally and 
temperature raising 
  of condenser is
    very low
YESNO No cooling
   If compressor 
can run after it stop to
 run five minutes and 
    give power.NO
!When charging refrigerant,we must 
notice to make refrigerant true. Refrigerant 
leak,check and 
repair charge 
refrigerant again. Check and repair according to 
the section of the compessor 
doesnt work. 
						

							3   
2 The compressor doesn’t stop 
 1 The thermostatwas 
set at the coldest position.
2 The ambient temperature is very high or 
the refrigerator is near by heat resource.
3 The door was opened too many 
times or there are more 
fresh food inside.
Check and repair the main 
control panelNOIscooling capacity  
insufficient.
YES YESNO Comprossor doesnt 
stop
Does the refrigerator 
refrgerate?NO
Adjust and instruct 
consumer how to use.NOCheck and repair according to 
the section of Cooling capacity 
is insuffcient. Check and repair according to 
the section of No cooling. Maintenance Service and Trouble Shooting  
						

							4   
3 Cooling capacity is insufficient YESRepair  Does the refrigerant 
leak siowly?.NO    Is the ambient 
temperature low than 
16℃YES
Adjust and instruct 
consumer how to use. Check the therostat is 
correct?Cooling capacity is 
insufficient 
 
 
 
 
 
 
 
 
 Maintenance Service and Trouble Shooting  
						

							5   
4 The compressor doesn’t work 
 Check the therostat is 
correct?Check the power 
source and power 
cord?
 Does the control 
panel has 220V power 
output?Check and repair the 
control panel.
 Does the compressor 
has 220V power 
output?
Check and repair 
compressor and accessory.YESYESNO
Check all cords and 
power cords.    Is the ambient 
temperature low than 
16℃ Does the refrigerated 
room lamp illuminate 
when the door is 
opened? The compressor doesnt 
work.YESNO YESYESNO
RepairAdjust and instruct 
consumer how to use.NO 
 
 Maintenance Service and Trouble Shooting   
						

							6   
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  
						

							7  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 domestic 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) Check refrigerator door seal ,case ,table surface and heat insulation 
layer . 
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 Maintenance Service and Trouble Shooting  
						

							8  Hums from a fully enclosed aggregate unit is the sound caused by 
overload indicating that the motor cannot be started normally ,meanwhile ,a 
clattering sound can be heard from inside the start relay ,which is produced 
because the start contacts cannot be released normally .A whistling sound 
is caused by the high pressure gas flowing out of the crack of the pressure 
tube inside the compressor ,and clucks are the sound of striking after the 
suspended spring inside the compressor has broken . 
During the normal operation of compressor ,a slight and uniform hum 
sound due to undulation of electric current can be heard generally ,this is a 
normal phenomenon .However ,if it sounds like “tong ,tong …”,i.e., an 
impact sound inside the compressor ,this means that a large quantity of wet 
vapour of  refrigerant or refrigerating oil has come into the compressor 
cylinder ;if it sounds like “dang ,dang…”, a striking sound of metal parts 
inside the compressor ,this means that some moving parts have loosened 
(note to differentiate this sound from those formed during starting or 
stopping the compressor). 
 b) Listen to the sound caused by the flowing of gas in the evaporator 
Open the refrigerator door while the compressor is in operation ,incline 
your ear and listen attentively the gas flow sound inside the evaporator .If it 
sounds like gentle whistling accompanied 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 flowing sound ,this indicates that the refrigerant has 
already percolated .If neither the flowing sound nor the gas sounds from 
the evaporator can be heard ,this means that the filter or capillary has been 
clogged . 
3)Touch and Feel 
a) Feel the compressor when running ,its temperature should be 
generally less than 90℃ in the normal state (it may exceed  90℃ in case 
of running for a longer period of time ). 
b) After the compressor has operated normally for 5~10 minutes , 
ouch and feel the condenser ,the temperature of its upper part should be 
higher than that of its lower part (or its right part is hotter than its left 
part ,depending on the type of condenser coil ),this indicates that the 
refrigerant is circulating . If the condenser is not hot ,this means the 
leakage of refrigerant .In case the condenser radiates heat for only several 
minutes and then cools down ,this means that the filter and capillary have 
been clogged .As for the forced air cooling condenser ,hot air will be blown 
out of it  ;this means that the system is out of order . 
c) Feel the filter’s temperature .During the normal operation of 
refrigerating system ,the temperature on the filter’s surface should be a 
little higher than the ambient temperature ;if you touch it with your 
hand ,you will have a sense of slight heat .In case dew condensation 
appears due to the fact that its temperature is obviously lower than the Maintenance Service and Trouble Shooting  
						

							9  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