Freezer section is at -15deg C but the refrigerator section air temp is at +12deg C. I have checked the fan is working (had ice buildup around it) and cleaned condensor behind the panel in the freezer. The thermostat is kicking in and out and the defrost timer is working. The air temp right at the outlet at the control box in the refrigerator section is at 1-2deg C. Have also tried setting the refigerator control to "colder" thus running the compressor longer to no avail. Can someone suggest what is left to check.
Thanks in advance.
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Most refrigerators have only one evaporator that handles both compartments. Only the very expensive ones have two evaporators that cool and independently control the temps separately.
Most simply circulate a small percentage of the cold air with a fan in the freezer section (where the thermostat that controls the compressor is getting its signal from) blowing over to the refrigerator section with the hope that that keeps things cool enough in the refrigerator section. If your LG is one of the common ones, it could be something a simple as a large object blocking the air flow between the two sections or a problem with the circulating fan. Also the dial that supposedly controls the temperature in the refrigerator compartment is sometimes connected to a linkage that determines how far a flapper door is help open or closed. Look for a problem in that linkage or damper door.
Test the fan for continuity. If its OK check the power supply going to the fan if power is there, fan is bad, replace it. Fan blows the cold air to the fresh food section, if its not working very little cold air gets to that side, thats why its so hot in there.
The way a refrigerator / freezer works is a single cooling coil in the freezer controlled with a thermostat. There is a fan that blows cold air down into the refrigerator section. There is another control that is just a vent control that changes the size of the opening for air flow. if the fan fails you don't get good cooling in the refrigerator section or if the defrost is not working correctly ice will build up and also stop the flow of air to the refrigerator. You should be able to hear the fan working inside the freezer. Replacing a fan motor is much simpler than troubleshooting an icing problem. There are several components that can cause defrost to not work. Bad temp cutoff switch, defrost timer or heater element could be causing that problem. With the unit unplugged and heater element disconnected you can use an ohm meter to measure resistance of the heater, should measure some resistance. Same with cutoff you should measure resistance when cold and none when above cutoff temp. Room temp is well above cutoff and use ice water to see if it closes.
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. Cut everything off for a few minutes then turn it back on
and listen for a click from the compressor relay as the compressor tries to
Is the compressor motor running.If no check starter/overload
relay. Check to see if the
condenser fan at the back underneath near the compressor is running. If no
Are the condenser coils near there warm or room temp. should
How to check stuff> http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php
Is the evaporator fan in the freezer running. It blows cold
air into the fridge side through a damper in the wall between the freezer and
fridge. Make sure the damper is open.
Below the evaporator fan is the evaporator coils. Remove the
back cover in the freezer to observe the frost pattern. Light frost everywhere(NORMAL)
or a partial pattern of ice(LOW ON FREON) or nothing(LOW FREON OR COMPRESSOR
Not all refrigerators are insulated the same and not all
condensers are in the same place. Your cold control is monitoring the
temperature of the refrigerator section and is designed to turn off the
compressor to keep things from freezing in that section. If it stays cold long
enough outside in your garage the cold control thinks its cold enough and won't
turn the compressor on. A makeshift closet to hold a little heat the unit
generates will probably help.
need to check for ice build up in air vent. if not make sure you hear your evap fan blowing in the freezer section. this blows your cold air into the fresh food side. do you have ice build up on rear wall of freezer section?
Generally when there is a problem with the freezer section temperature there is also a problem with the refrigerator section temperature.
You can check and make sure the condenser is clean. This is where the heat is moved to the outside air (room air). Look behind the refrigerator for a removable panel. Behind the panel there is the condenser which needs to be cleaned at least twice a year. There is a fan motor which moves the air to remove the heat from the system. This fan must operate at the same time as the compressor.
Unless specifically made for use in a garage most units won't work properly. The owners manual should say what the temp range for proper operation is (usually 55F is the low range). This is because the refrigerator section doesn't need to be "cooling" to maintain 37F if the temps on the outside are below 55F. These things are made to work in a 70F room and will not work properly if under 55F. Stupid thing thinks it's cold enough so it will never turn on, the refer section will stay cold/cool due to outside temps but since the compressor never runs the freezer will just be the same temp as the refer section (at best). Sorry, but in order for a freezer or refrigerator to work in an unheated space it must have the temp control device controling the freezer section NOT the fresh food section. In other words, that model will not work in a garage unless the temps are above 55F always.