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You can but the unit will have not control over temperature, and you can cause the unit to freeze up or slug the compressor w/ liquid refrigerant causing premature compressor failure. I would recommend replacing the thermostat if it is not holding proper temperature, but if dead set on bypassing it use a volt/ohm meter after unplugging it to find the normally open contacts and wire those wires together taking into consideration that the fan must run constantly with the compressor.
Well, the control circuit get input from thermostat. what you need to change is right the thermostat. I do not think there is any way to lower fridge temp if you do not replace thermostat.you could put an additional switch to turn on/off manually the compressor when you need extra cold, but in this way you risk to damage the motor. You need to change the thermostat with one that switch on at a lower temperature. to do this you may need to use a non-fabric part.
This solution probably costs more than you care to spend on the problem, but you can buy an external temp controller like this one:
You run the probe into the fridge and plug the fridge into the controller. Then the controller will only turn on the fridge if it gets warmer than the temperature you specify.
You might be able to find it cheaper on ebay, too. I'm using this on a kegerator and can keep my beer at a consistent temp.
The thermostat is stuck in the closed position if you noticed that the unit runs and runs and runs without cycling off sometimes. If it cycles, move the thermostat setting up in number (warmer). Make sure, if the unit is in your garage or otherwise not inside where it is warm, that the temp of the outside air isn't below freezing - coolers don't do warming and will not protect the beer from frigid atmospheric temps. Good luck.
Most evaporator fans run all the time. This is mainly to use the air flow to assist in melting off any frost build up during the compressor off cycle. If that fan shut off with the compressor the coil will have a tendency to freeze up. :)
not necessarily, is it maintaining temp? all food staying frozen? especially ice creams if stored in there. most newer freezers displace the heat generated while cooling the food through copper lines running through sides of unit, helps to cut down on air temp differences between the inside (0 degrees) and outside temp to prevent moisture and possible condensation causing premature rusting of unit
The defrost timer in the unit is probably bad take a look at it there should be a timer with a slot in it around the thermostat that you can turn with a common screwdriver the timer should click and go into defrost mode and the unit should shut off, if the unit shuts off and it still doesn't defrost you either have a thermal cut-out that is bad in the freezer next to the heater element or the heater element itself is bad.
Let us know :-)
Could be the thermostat isn't working and the unit is just running and running all the time. To me that seems the most simple explanation right now. Can you check the temp inside when on the lowest setting for a day, then turn it up to the highest for a day and see if there is a huge difference in temps? Does the compressor motor ever turn off or does it run continuously? Suspect that t-stat...