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...

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...

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...

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...

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...

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...

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...

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...

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...

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...