I had the same problem recently with all my fridge food freezing up, this all seemed to start when i discovered the interior bulb blown i replaced it still nothing also noticed warning lights on front out,i could hear the motor going so i knew it was on i removed back cover and found the heater covered in ice it turned out it was the failure of the control board causing these problems had it replaced and working fine now hope this is of help dmb23
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I've been on fridges where this happened. I've found the thermostat to be the issue, or the temp sensor to be the issue. It's hard to check without being there with the proper equipment. It may be worth the money to contact a service tech. lmk if you need more help!
Most times this is a bad cold control, but there are other things to check for. Make sure the condenser fan is working and the coils are not covered with dust. A separated heat exchanger ( small capillary tubing soldered to the large suction line ) can separate from one another and make the fridge run too long. - tape tubing back together. A poor working evaporator fan motor could also make the fridge run too long and freeze - replace the fan motor. An inefficient compressor or refrigeration system could make the fridge run too long and freeze - have a service tech check this out. A misaligned control settings, make sure the air damper and cold control have not been bumped and are out of normal settings. Stuck open air diffusers or air dampers are becoming more and more common for allowing too much air to be blown into the fresh food section and freezing things. On all frost free fridge's the freezer temp air is blown into the fresh food section, if you have "easy" to freeze items ( eggs, veggies in water, etc ) in front of or under where the freezer temp air comes out, they could freeze - store them in a different spot. Doors not closing properly making the fridge run too long is something else to check for.
Check the cold control and the air deflector. As you know, the deflector directs the freezer air toward the front of the frig and the rear of the cold control. Hope this helpout .....
Sounds like a defrost problem. Check to see if
there is any frost buildup in the back wall of the freezer. If so, it is not
defrosting as it should.
bad defrost timer/board
bad defrost heater (in freezer)
bad thermo switch in freezer
you don’t know what these are then unplug the machine and let the ice melt in
the freezer overnight with the door open. Then try it the next day, if is
cooling fine then you need to have a service person replace one of the above
items. If it still has a problem then it might be the compressor and you should
probably replace the machine.