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Check the door gasket carefully for cracks or other leaks. It is crucial to have a good barrier between the moist room air and the super-dry air inside the box that will quickly suck in the ambient humidity and form frost.
It would be difficult to change the sensor and the heater, and if the defrost cycle is running (and you feel some warmth around the bottom of the box when it is cycling) then the sensor and heater assembly are working and do not need to be replaced. The best practice is to remove any frost buildup at regular intervals and often to prevent a thick buildup that is difficult to remove.
It usually means that your door is either not closing properly or the seal is deformed. Moist air is getting in and condenses on the coldest surface at the back of the freezer. Check that the freezer is not too full (stopping door from closing fully) and check the door-seal.
Sometimes it is caused by icing of the thermostat. Ice is a good thermal insulator so the thermostat does not switch and the freezer keeps running constantly. Make sure there is adequate air circulation and no ice around the thermostat.
W10224328 Dispenser Door Spring The chute door is the reason your ice bin is freezing up and also the chute door being open draws warm moist air inside your freezer compartment causing massive amounts of frost and keeps the compressor runing all the time between defrost. You really n eed to get the chute door fixed. What is the correct model number? For the model KSRX25FT dispenser parts click HERE The chute door spring may be broken but you will not know untill you open the dispenser housing. I'm here should you post the correct model number or have questions, Sea Breeze
Check the ice maker. sometimes they get cracked a will leak water into the freezer compartment. Also check the ice maker fill tube for leaks or someone could have spilled something. Although this is tipical of a clogged drain. What happens is when the fridge go into derfost, it will melt all the frost that is on the evaporator, turning it into water. The water drains down to a trough under the evaporator and down a drain hole in the trough ( this trough is behind the evaporator cover ) Removing the melted frost from the freezer. If that drain is clogged, the water cannot leave the freezer. Then when the fridge starts back up ,it will freez the water that was not drained. After repeated defrosting the water will fill this trough and run off into the bottom of the freezer to be frozzen when the fridge starts to cool again.
It sounds like you are getting large amounts of warm moist air into the freezer. This can be caused by the door being left cracked open or the door seal not sealing properly. Check your door gaskets on both sides of the refrigerator. One other possible is the ice chute. If it is not closing all the way it will cause the same problem. You will get alot of frost forming in the freezer then it will melt when the refrigerator defrosts. Let me know if this helps, and if you have anymore questions.
sounds like you have a clogged defrost drain tube. removing back panel of freezer will give you access to drain trough, melt away the ice with a hair dryer, youll find a drain hole under there somewhere,pouring boiling water down the drain will clear it pretty quickly( i use a steam machine purchased from the infomercials works awesome, after you clear it and all water drain down tube wrap a piece of solid copper wire around the heater( black heater right above the drain trough) and stick it in the whole maybe an inch or so. now every time the heater comes on to defrost it will prevent the hole from freezing over
Check nothing is holding the door ajar, and that the door seals are closing properly all the way round.
The abnormal thing about abnormal ice buildup isn't the fact that it's frozen - it's the fact that the water is getting in. The only way water is going to get in without you noticing it is in the form of moist air - and the biggest, most regularly disturbed way in for moist air is the door and its seal.