This problem could be cause by a few things. Can you tell me if your condenser is clean? If it is dirty, the heat cannot be rejected. Will you feel the large copper line going to the compressor and tell me if it is cold to the touch? If it is not col and your compressor is running you may be low on refrigerant. Also, is the evaporator frozen over? If your evaporator is frozen over you might be low on refrigerant, or you evap fans may be out.
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Check the thermostat, and the cooling fluid.
Tao the thermostat en see if it will start the compressor. When you hear the compressor running and still no cooling, you must have lost the cooling fluid. (used to be freon)
The most common problem is low refrigerant (freon). If you don't have gauges to check the pressure of your refrigerant, do this: the compressor has one small line running to the coils on the top of the freezer. That small line should be hot enough to burn your finger if you touch it when the compressor is running. Also the big copper tube running into the compressor should be cold to the touch, almost freezing. If not you are probably low on refrigerant. Without gauges and the ability to buy freon, you will need to hire a refrigeration repair service to find the leak in your system, repair it and then gas it up. But there are a couple of other things to check first. Near the compressor is a radiator like set of coils in front of a fan. If the compressor is running that fan should be running too. if not, the unit won't cool. Also the radiator coils may be covered with dust or grease. You must have a good flow of air through these coils to dissapate the heat put out by the compressor.If it is stopped up, brush the dust from the front of the coils. Look inside the freezer as well and make sure the inside coils are not frozen over. Is so unplug the unit and let the frost melt off. If that is happening you may need a new timer on your drfrost system.
Inside the refrigeration system alot is goning on. You have to check the pressures low/high to determine the problem. It is easy to say that your unit needs freon but that is not always the case.
here is a list of possible problems:
fans not working
defrost not working
lost of freon
bad compressor valves
lack of oil
super heat off
txv is stuck open/close not sensing
incompatilbe unknown freon mix...
well these are just some of the problems you can encounter. this was meant to tell not fix because each problem needs attention but hope this was a little helpful anyways
The fans are controlled with a clixon that has a cut in at 5 degrees, and cut out at 20 degrees. If the unit is running and the fans are not comng on then I would have to say you are out of freon. But your condensor fan could be running and the compressor NOT be running which could be a problem with your compressor. Find out if your compressor is running by taking an amp draw. If compressor IS running then you are low on freon. If the compressor is running and your evaporator coil is cold and your fans AREN'T coming on then your clixon is bad.
only reason refrigerent may be needed is that there is a leak so adding more will achieve nothing. unlikely to be needed. i assume compressor is running. probable causes of no cooling are compressor fault or a blockage in the pipe sysyem. not diy