It could be the
defrosting clock usually positioned at front bottom behind the removable
grill or in the back. This clock times the running and defrosting time, so if stuck on run it will never go to defrost cycle and the ice piles up.It has a one way slotted fit. Use a wide flat screwdriver to
slowly turn the dial until compressor stops, (defrost cycle) this will not only stop compressor, but also turn on that tube heather you where talking about to melt ice off evaporator. Then wait (up to 30 minutes) to see if starts up
again(run cycle). If it does not, clock needs replacement. You can then turn clock again slowly to turn compressor back on so you can use fridge until repaired. You can do this off and on daily to manually defrost unit until repaired. If this is not your problem it could very well be the heather tube, but they rarely go out. Best I can do without being there, hope it helps you. Frank
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Door Seal might be defective causing the door not to shut tightly this causes air from the room to get into the freezer through the opening and as the air comes in contact with the evaporator coils, it freezes. Normally the defrost system removes the ice but if the seal is defective the coils freeze too quickly and the defrost system cant keep up
If the freezer evaporator coils ice over, the defrost thermostat might be defective. Several times a day the defrost heater turns on for a few minutes to melt away any frost that may have accumulated on the freezer evaporator coils. In order for this to work, the defrost thermostat has to sense that the coils are cold enough. If the coils are cold enough the defrost heater will turn on. If the thermostat is defective it may not be able to sense the temperature of the coils and then won't turn on the defrost heater. If the defrost heater doesn't turn on, the evaporator coils ice over and eventually no air will be able to travel through the coils to provide cooling to the freezer. The defrost thermostat can be checked for continuity. It should have continuity when it reaches the low temperature of its operating range.
The defrost cycle is not working properly, there are three things involved in system. #1 Defrost timer in refrigerator #2 Thermostat on coils to tell if unit is frozen #3 heater element located under coils thaws coils when frozen. the defrost timer if it is manual < located at the front of light assembly panel in top of refrigerator there will be a hole with a plastic piece that resembles a screw strait screw head> it turns and every 8hrs aprox. it stops operations and starts defrost cycle by allowing voltage to the thermostat and if thermostat is frozen it allows power to element for thawing coils. If defrost timer is manual look for direction it is facing and mark edge to see if timer is turning< very slow turning and is easiest way> if you can get an ohm meter ohm the element on high setting< if it has continuity element is operable> check wiring just to be sure not problem. If you find the timer does turn and doesn't stay in one position over 40 minutes then the thermostat is bad.If element fails tesing then the element is bad and if timer stays in one position then it is bad. If unit is equiped with electronic defrost timer and element is good in would replace timer and thermostat to guaranty that resolved problem
You have an automatic defrost problem. Here are the three components that can cause this defect in order of most common to least. #1 defrost timer or equivalent adaptive defrost control board, #2 defrost termination thermostat (should be replaced regardless since it has been frozen in ice several times) #3 defrost heating element(rarely fails but is possible). If you have a meter you can check the thermostat and element for continuity they should show an infinite reading if they are operational. the termination thermostat must be below 35 deg f to show a closed circuit.
when the coils ar emanually thawed does the water get removed by the drain ho;le or are you having to soak it all up with a shop vac? The drain may be frozen up and that would cause the water to stay in the freezer and product ice.you said that the coils foreese over after several minutes does tha fan come on and start moving the air over the coils? theres a sensor that should be bringing on the fan and that should keep the coils from freezing up. On thae back side of the panel is there styrofoam on it ? if there is stryofoam is part of it missing and the air flow now incorrect? Just a few more things to lok at. Thanks For using FixYa and don't forget to rate this solution please.
defrost system problem tell me more,is the fan in the freezer working,can you find the defrost timer and put it in defrost?this way you can remove the freezer back panel and see if the defrost heater comes on,let me know what you find-mike