Haier Hrf 369aa Service Manual

							10  There are so many joints and sealed surfaces in a 
refrigerator ,accordingly ,quite a lot potential leak points do exist in the 
system .In troubleshooting ,pay attention to those parts that are liable to 
leak ,check main connection points for oil seepage and tubing for cracks .If 
there is no severer leak point ,charge the system with nitrogen and detect 
leak points with the commonly adopted method ,repair 
them ,evacuate ,charge the system with refrigerant ,and then turn on the 
refrigerator to make a test run . 
2) Too much refrigerant charged into the system 
Analysis of Trouble 
a) In case the amount of refrigerant charged into the system exceeds 
its nominal capacity ,the superfluous refrigerant will of course take some 
space of the evaporator ,thus reducing its heat-dissipation area and hence 
the refrigerating efficiency of the system .The abnormal phenomena 
caused by this reason are as follows :the gas suction and exhaust 
pressures are generally higher than their respective normal values ,the 
temperature of its condenser is higher and the electric current of the 
compressor rises ,loose frost forms on the evaporator ,the refrigerator 
temperature drops slowly ,and frost appears on the gas return tube . 
b) In case excessive 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 refrigerant evaporates and effervesces as soon as it flows into the 
refrigerating oil at the bottom of compressor .If the condition is 
severe ,foams will fill all over inside the compressor housing and be sucked 
by the piston ,causing damage to the components of compressor . 
Remedy 
According to the operating procedures ,it is mandatory to turn the 
machine off ,and several minutes later ,open the refrigerant charging tube 
and let the refrigerant escape from it ,replace the dry filter ,recharge 
refrigerant after evacuating ,and then seal the charging port . 
3) There is air left in the refrigerating system 
Analysis of Trouble 
Residual air in the refrigerating system will reduce its refrigerating 
efficiency .The prominent phenomena are the increase in its gas suction 
and exhaust pressures (however ,the gas exhaust pressure will not exceed 
its rated value ),obvious increase in temperature in the segment from the 
compressor outlet to the condenser inlet .Because there is air in the 
system ,both the gas exhaust pressure and temperature will rise ,and 
moreover ,the gas flowing sound is intermittent and obviously louder . 
Remedy 
After shut down for several minutes ,open the tubing ,evacuate it and 
then recharge the system with refrigerant . 
4) Low efficiency of compressor Maintenance Service and Trouble Shooting  
						

							11  Analysis of Trouble 
Low efficiency of a refrigerating compressor refers to the actual 
reduction of gas discharge capacity ,and hence the corresponding 
reduction of refrigerating capacity ,under the condition that the refrigerant in 
the system is unchanged .This phenomenon occurs mostly when the 
compressor has been used for quite a long time ,its moving parts have 
worn to a considerable degree ,fit clearance between various parts have 
increased and sealing property of its gas valve has deteriorated ,resulting 
in an decrease in its actual gas discharge capacity . 
Methods of Judgment 
Measure the high and low pressures with pressure gauges to see 
whether they are normal .If an abnormal sound comes from the compressor 
or the temperature of its causing is too high ,Cut the discharge port open 
and operate the compressor ,feel it if there is pressure at the discharge port 
with your finger (For a normal compressor ,its discharge port is difficult to 
be blocked with your finger if you just apply a little effort). 
5) Too thick frost layer formed on evaporator 
Analysis of Trouble 
If a direct cooling refrigerator is to be used for a prolonged period of 
time ,be sure to defrost its evaporator 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 transparent ice layer ,and finally the temperature in the refrigerator 
cannot drop down to the prescribed range . 
Remedy 
Turn the refrigerator off ,and make preparations for defrosting ,open the 
refrigerator door to let the air come in ,or use a fan to speed up air flowing 
so as to shorten the time needed for defrosting .Never strike the frost layer 
with any iron tools or wood stick in order to avoid damage to the evaporator 
tubing . 
6) Refrigerating oil left in evaporator tubing  
Analysis of Trouble 
During the process of refrigerating cycles ,a little refrigerating oil may 
remain in the evaporator tubing ,and after a longer time of operation ,if 
there is considerable refrigerating oil left in the evaporator ,the heat 
conduction effect will be severely affected ,thus causing a poor refrigerating 
effect . 
Remedy 
It is quite difficult to determine whether this trouble is caused by the 
refrigerating oil left in the evaporator tubing ,because this kind of 
phenomenon and other several trouble are tends to be confused .Generally 
speaking ,you can make a judgment based on the frost formed on the 
evaporator .If the frost does not cover the evaporator , and moreover ,it is 
loosely formed ,you can make a judgment that the deterioration of Maintenance Service and Trouble Shooting  
						

							12  refrigerating effect is due to the accumulation of refrigerating oil left in the 
evaporator tubing in case no other troubles have been found . To clear off 
refrigerating oil left in the evaporator ,dismantle the evaporator ,purge it 
thoroughly and then dry it .In case it is difficult to dismantle it ,charge 
refrigerant from the evaporator inlet to wash it several times ,then purge 
and dry it with nitrogen . 
7) Flowing obstructed in refrigerating system 
Analysis of Trouble 
Because the refrigerating system was originally not purged 
thoroughly ,some of the filter screen meshes have been clogged by dirt 
accumulated in the filter after using it for a certain time of period ,thus 
resulting in a decrease in flow rate ,and hence a poorer refrigerating effect . 
The abnormal phenomena caused by this kind of slight clogging in the 
system are as follows: the gas discharge pressure is lower ,the 
temperature of discharged gas drops down ,the position clogged has a 
temperature lower than that in normal conditions ,and for a severe 
clogging ,even dew condensation as frosting may appear . 
Remedy 
Purge the tubing ,and after replacing the dry filter with a new one or 
clearing it thoroughly ,recharge the system with refrigerant 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 not drop down is called “no refrigerating”. There are 
many causes for this trouble and it is relatively complicated , too . In 
servicing ,special attention to finding direct causes for this 
phenomenon .Three main potential causes for this trouble are analyzed 
below : 
1) All refrigerant in the system has leaked out 
Analysis of Trouble 
Leak points in the refrigerating system have not been found and 
repaired timely ,thus resulting in the total escape of refrigerant .There are 
two kinds of leakage :I) slow leakage for instance ,when we want to use a 
refrigerator that has been put out of quite a long time ,we find the leakage 
of refrigerant ,or in the course of its operation ,we have found that the 
refrigerator is gradually becoming not so cold and finally no refrigerating 
cab be achieved ; ii) fast leakage in that  case ,all the refrigerant will 
escape swiftly due to abrupt rupture of system tubing . 
Symptoms of total leakage of refrigerant are mainly as follows : the 
compressor can be started easily (if there is no damage to the compressor 
parts) and its operating current becomes low ,its gas suction pressure is 
high and discharge pressure is lower ,the gas discharge tube feels rather 
cold ,no sound of gas eruption from the liquid in the evaporator can be Maintenance Service and Trouble Shooting  
						

							13  heard ,and no will gush out of the process tube if you cut it open after 
shutdown . 
Remedy 
Check the whole machine , particularly those locations which are liable 
to leak .After leak points have been found ,repair them or replace them with 
new parts according to specific circumstances ,then evacuate the system 
and finally charge refrigerant. 
2) Refrigerating system has been clogged 
a) Clogged with Ice 
Analysis of Trouble 
The dryness treatment for the major parts in the refrigerating system 
has been performed improperly, the effect of air purging for the whole 
system is not good ,or the water content in the refrigerant is out of 
standard ,all these will cause the expansion valve to be clogged with 
ice .The symptom for this trouble are as follows :the refrigerator sometimes 
can refrigerate and sometimes cannot :the refrigerator compartment works 
normally at the beginning ,but after working for a certain period of 
time ,frosting begins at the clogged position ,evaporation temperature 
reaches below 0℃, water will accumulate at the narrow part of the capillary 
and clog it gradually ,then frost begins to melt at the evaporator ,no gas 
flowing sound can be heard ,and the gas suction pressure assumes a state 
of vacuum .Note that 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 to make ice melt ,and after a while if a gas flowing sound resulting 
from an abrupt gush is heard and the gas suction pressure rises as well ,it 
can be confirmed that the trouble is caused by ice clogging . 
Remedy 
If there is too much moisture in the refrigerating system, it is advisable 
to release the refrigerant, purge the tubing with nitrogen, and then charge 
the system with the filtered refrigerant. However, the commonly adopted 
method is to connect a filter with moisture absorbers (such as silica-gel, 
anhydrous calcium chloride) to the refrigerating system so as to filter out 
the moisture from the system, then replace the filter, evacuate it again and 
finally charge the system with refrigerant.  
b) Clogged with dirt in capillary  
Analysis of Trouble 
The capillary inlet is a place where coarse-grained dirt or refrigerant oil 
in the system will tend to settle down and clog it. In case considerable dirt 
accumulates there, the whole filter screen may be blocked totally, making 
the refrigerant unable to go through. Clogging with dirt exhibits the same 
symptoms as that with ice, namely, higher gas suction pressure, lower 
temperature of discharged gas, and no gas flowing sound from the 
evaporator. The difference between the both is as follows: if the clogging is Maintenance Service and Trouble Shooting  
						

							14  caused by dirt , tapping the suspicious clogged point (generally in the 
capillary or the connection joint of the filter) may cause the refrigerant to 
flow through partially, resulting in some corresponding change, whereas in 
that case if you heat it with a hot towel, no reaction will happen, no flowing 
sound can be heard, moreover, there is no periodic change. After rejecting 
the possibility of ice clogging, it can be generally considered as the 
clogging due to dirt . 
Remedy  
Dismantle the system, remove the dry filter from it, purge the tubing with 
nitrogen, install a new filter, then evacuate it and finally charge it with 
refrigerant.  
C) Clogging in filter 
Analysis of Trouble 
Total clogging of a filter is rarely to occur. This trouble is mostly caused 
by the paste-like matter formed from the substances filled into the system 
or other dust after the refrigerator has been used for a longer time, or by 
the dirt accumulated gradually inside the filter. Sometimes, tapping the filter 
nay cause a passage for flowing, Touching it with your hand, you will feel 
that it is cooler compared with its temperature in the normal state. 
Remedy 
The same as described in the capillary clogging 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 discharge valve to suck and discharge the refrigerant. If 
the valve block is broken, the refrigerant can not be discharged, and hence 
no refrigerating can be achieved. 
Method for making judgement  
It is quite difficult to differentiate this trouble from others because they 
often have similar symptoms. In repairing, firstly, hear attentively if there is 
some abnormal sound coming from the compressor (sometimes , the 
broken pieces of valve block may strike against the cylinder), and feel the 
compressor casing with your hand to ascertain whether it is too hot, this is 
also helpful to the troubleshooting; secondly, measure the pressures at the 
high and low pressure ports of the compressor with pressure gauges, if the 
gas suction valve block is broken, the suction pressure gauge pointer will 
swing violently and the suction pressure is very high, whereas when the 
gas discharge valve block is broken , the discharge pressure gauge pointer 
will swing drastically and the discharge pressure is very high. In the both 
cases, stop the compressor at once, and if technique is available, open the 
cylinder cover and check up the valve block, repair it, or replace it with a 
new one,  
C. Sudden stop of Compressor during Its Running  Maintenance Service and Trouble Shooting  
						

							15  The cause of sudden stop of a compressor during its running is mostly 
that the gas suction pressure and/or discharge pressure exceed their 
respective prescribed ranges, thus making a pressure-operated protective 
relay shut off the power to the compressor and stop it. In the following we 
discuss mainly the reasons for causing excessively high gas discharge 
pressure and low suction pressure. 
1) Stoppage due to excessively high gas discharge pressure 
A) Too much refrigerant charged into the system  
Analysis of Trouble  
The phenomenon, such as loose frosting and poor refrigerating effect, 
may occur if excessive refrigerant has been charged into the system. 
Superfluous refrigerant will occupy a certain space of the evaporator, thus 
reduce its heat dissipating area, and the phenomenon of “liquid striking” 
may occur, too. Meanwhile, dew or frost condensation may occur on the 
gas return tube, and the gas discharge pressure will obviously rise, when it 
reaches the threshold value, the protective relay will actuate and shut off 
the power supply to the compressor. 
Remedy 
Open the tubing, re-evacuate and then charge the system with a proper 
quantity of refrigerant. 
b) Air left in the 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, higher discharged gas temperature (the gas 
discharge tubing is considerably hot when you feel it with your hand), and 
poorer refrigerating effect. Furthermore, the gas discharge pressure will 
exceed its normal value when the compressor has run for a period not too 
long, thus making the protective relay actuate and bring to a stoppage. 
Remedy 
Check up how the air has been left in the refrigerating system. 
Generally, there are two possibilities: one is that the air has been sucked 
into the system when repairing due to carelessness, or it has not been 
purged out totally when evacuating the system; the other is that there are 
leak points at the low pressure end of the refrigerating system. Leak points 
appear mostly in those low temperature parts or assemblies, because the 
evaporation temperature is lower for such low temperature devices, 
especially at the low pressure end, it is easier for the air goes into the 
system. Once it has been ascertained that air does exist in the system, you 
have to open the tubing, re-evacuate it and then charge it with refrigerant. 
2) Stoppage due to electric troubles  
a) Thermostat  is out of control 
Analysis of Trouble  
In case the thermostat does not work in its good order or its Maintenance Service and Trouble Shooting Maintenance Service and Trouble Shooting  
						

							16  temperature sensor has not been installed properly, frequent stoppage is 
also likely to occur. 
Remedy 
Try to adjust the temperature sensor’s position until the compressor can 
be started and stopped normally. If this cannot be achieved, and the 
stoppage still occurs repeatedly, it is most likely that the mechanical parts 
or contacts are out of order, disassemble the thermostat, make a thorough 
checkup and repair it. 
b) Overload of electric motor  
Analysis of Trouble  
Probably, too many things have been put into the refrigerator, and 
hence the thermal load exceeds its refrigerating capacity ; or in case the 
power supply voltage drops considerably, the current flowing through the 
motor will increase drastically making the thermal protector actuate and the 
fuse blown , and hence the motor stops running. If the motor is still running 
continuously in such a case , its windings will be burned out . 
Remedy 
Reduce the thermal load, pay attention to the variation in voltage of the 
power 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 new one. 
3) Sudden stoppage due to other causes  
Normal Stoppage 
Start and stop of the compressor is generally controlled by a thermostat . 
When the temperature in the refrigerator reaches its desired value, the 
thermostat will shut down the compressor automatically. Never take this 
normal operation as a trouble, care should be taken to differentiate it from 
other real troubles in servicing. 
D. Compressor won t start 
In case the compressor cannot be started, you must find out the origins 
of this trouble through checkup step by step, because probably there are 
many causes, including those electrical and mechanical. 
1) Inspect the power supply to see whether it is connected to the 
compressor circuit. 
Analysis of Trouble 
In case the compressor cannot be started, this will generally exhibit in 
the power supply circuit, for instance, power failure, poor contact of switch, 
and blown fuse. Make a comprehensive analysis of these phenomena, fine 
out its real cause and take correct measures to remove this trouble. 
Remedy Maintenance Service and Trouble Shooting  
						

							17  a) Check the input power circuit to see whether where is voltage of the 
power supply,  namely, the circuit which is connected to the knife switch. 
This can be determined with an avometer or a test pencil. If a blown fuse is 
found, ascertain and remove its cause, then replace it with a new one of 
the same specifications. 
b) Check the compressor accessories, including its thermal protector 
and relay. In case the thermal protector is damaged, the compressor 
cannot be powered on. If the relay is out of order, the motor will not run and 
hum sound can be heard from it after the compressor is turned on, in that 
case, shut it down immediately, otherwise, the motor windings will be 
burned out in case this condition lasts longer. 
c) Check the relay contacts and plugs to see if they are perfect and 
work reliably. Poor contact may cause the motor not running or humming. 
2) Check the circuit voltage to see whether it is normal. 
Analysis of trouble 
If the circuit voltage is obviously lower than its rated value, it will be 
difficult to start the motor, and a hum sound can be heard from it. 
Remedy  
Measure the voltage with a voltmeter, if it is really too low, give 
directions to the 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 thermal relay sometimes may be open due to the 
leakage of temperature sensing agent from the temperature sensor. 
Remedy 
Remove the relay cover to check up its contacts, if they are open, this 
means that the original setting is not properly set or temperature sensing 
agent has leaked out of the temperature sensor. Try to turn the adjusting 
stem of this value in the direction of the lower temperature graduation, then 
check the contacts to see whether they are closed. If they are still not 
closed, dismantle the temperature sensing disc and then immerse it into 
warm water to see whether the contacts actuate, if not, it can be 
preliminarily determine that temperature sensing agent has leaked out, and 
it must be replaced with a new thermostat. 
4) Motor troubles and other electric faults 
a) Motor windings have been burned or short-circuited between turns 
Analysis of Trouble  
When motor windings have been burned or short-circuited between 
turns, the fuse will be blown repeatedly, and the blowout occurs particularly 
at the instant when you close the knife switch. 
Remedy  
Check the terminals and the outer casing to see whether they are 
short-circuited, and measure the resistance of each phase with an Maintenance Service and Trouble Shooting  
						

							18  avometer. If short circuit occurs or the resistance of a certain phase is low, 
this means that short circuit does exist in the windings and/or between 
turns, and insulation layers have been burned or deteriorated. A 
megameter can be used in this inspection, too. I f the insulation resistance 
is lower than 2 MΩ, this means that the insulation layer is already 
breakdown. If the motor has been burned, repair it or replaced it with a new 
one. 
b) Fault of control relay 
Analysis of Trouble  
Overheat, burnout or wear of control relay contacts may occur generally. 
All these will cause poor contact in electricity. 
Remedy  
Dismantle it to repair, or replace it with a new one. 
c) Poor electric contactor in thermostat 
Analysis of Trouble  
Burnout of contactor and leakage of temperature sensing agent may 
occur generally. 
Remedy 
Replace the old with a new one. 
d) Check the terminals for loose connection and electric circuits for 
other abnormal phenomena. 
5) Mechanical faults of compressor 
a) Seizing of shaft 
This phenomenon is 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 increase its viscosity and cause the shaft to be seized. Copper plating 
may also result in seizing of shaft. 
b) Seizing of piston 
This is caused by too small fit clearance between the piston and 
cylinder or expansion due to heat. 
Judgement of seizing shaft and piston: After the refrigerator has been 
powered on, the compressor will not start and run, but a slight hum sound 
can be heard, and several seconds later, thermal protective relay will 
actuate and make the contacts open; this process will occur repeatedly, but 
the compressor cannot be started. 
E. Compressor won’t stop 
Sometimes, the compressor will run continuously(for several hours or 
run without end), If the food placed in the refrigerator is not too much, there 
may be the following two situations: i) the refrigerator very low, this means 
that the control system is probably out of order; ii) the control system works 
normally, and there are troubles in the refrigerating system or other parts. 
1) Temperature is set improperly 
a) The temperature control knob is set to the “coldest” position. This Maintenance Service and Trouble Shooting  
						

							19  position is to be used for fast freezing or continuous running, its 
temperature for power off is too low, therefore, the compressor won’t stop 
and the temperature in the refrigerator becomes lower and lower .  
b) Inspection method: check the temperature control knob to see 
whether it is set in the position “coldest”. 
2) Thermostat is malfunctioning and makes the compressor running 
continuously 
Analysis of Trouble 
When the thermostat doesn’t work normally, it will make the compressor 
run continuously, and hence very low temperature will be achieved in the 
refrigerator. The fault is generally due to the fact that the contacts of the 
thermostat cannot be released. 
Remedy 
Dismantle the thermostat and make a through checkup, if it is totally out 
of functioning, replace it with a new one. 
3) evaporation temperature is too high in refrigerating system, resulting 
in lower refrigerating capacity and hence continuous running of compressor 
Analysis of Trouble 
Leakage of refrigerant and clogging in a refrigerating system will directly 
affect its refrigerating capacity. Due to the reduction in its refrigerating 
capacity, the refrigerator temperature cannot reach its 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 hotter, therefore, the thermostat is 
unable to cut off the power supply to the compressor and stop it. 
Remedy 
If it has been found that the refrigerant in the system is insufficient in 
quantity, recharge it with refrigerant. In case clogging occurs, disassemble 
the part where it is blocked. If the evaporation temperature is too high, 
settle this problem with an appropriate quantity of refrigerant. 
4) No stoppage of compressor due to damaged heat-insulation layer 
inside case body and/or door seal 
Analysis of Trouble 
When the heat-insulation layer inside the case body deteriorates or the 
door seal is not closely touches the door frame, the temperature in the 
refrigerator will rise and makes the compressor running continuously. 
Remedy 
Check the heat-insulation layer for its damaged parts, repair it to 
improve its heat-insulation property. If the door has deformed or the door 
seal is not tightly sealed against the case body, repair them, respectively. 
5) Too much food is placed in the refrigerator, or is placed too densely, 
resulting in poor ventilation or poor conditions for temperature sensing, and 
hence no stoppage of the compressor. 
6) Too high ambient temperature, poorer ventilation and heat Maintenance Service and Trouble Shooting