Freezer iced up on my 55602400
What can you do about this. so you get an understanding of what is going on here is a short explaination of how the defrost works in the freezer section behind the freezer panel.
The coils inside the freezer are the only part inside the whole refrigerator that "get cold".The fan blows the cold air from the freezer into the fridgerator side. They need to stay free from excess frost build up so that air can pass through the coils and reach the refrigerator section of your refrigerator. Every eight hours or so, depending on the type of defrost timer or control you have, the compressor and fans will shut off and the machine will go into defrost mode.When the refrigerator is in defrost there is a heater that is tied into the evaporator coils inside the freezer that comes on. This heater is behind the rear panel inside the freezer where the evaporator coils are located. It melts the frost that has accumulated over the course of time. After about thirty minutes the machine comes out of defrost and goes back to normal operation.
Now the air can continue to pass through the coils and keep the freezer frozen and the refrigerator cool the defrost cycle is made up of 4 functioning parts the defrost timer, the defrost heater, the defrost thermostat and the fan .I will go through what each of these do
The Defrost timer Some refrigerators have a defrost timer. This type located on the inside upper ceiling of your frigerator works like a clock. Every eight hours or so the machine hits the defrost spot and that's when defrost occurs Some refrigerators have an Adaptive Defrost Control. This is what makes a refrigerator energy efficient. It varys the length of time it takes the machine to go into defrost. Some models dont have a defrost timer and instead use a control board that works just like the timer it is usually located in the rear of the machine under a metal panel.
This is the component that controls how long the heater stays on when the machine is in defrost mode. Say the defrost cycle is thirty minutes, the heater may only be on for ten of those thirty minutes on the timer controls. On Adaptive Defrost Controls, when the heater shuts off, shortly after the machine exits defrost mode. Basically if the heater only stays on for ten minutes, the whole defrost cycle will only be about 12 or 13 minutes long.
Basically when the heater comes on, it starts to melt the frost on the evaporator. Once all the ice and frost is gone, the temperature behind the panel will start to rise. Once the temperature behind the panel rises to a certain temperature, the thermostat will break the current of electricity going to the heater. Bam, it shuts off and prevents your freezer from becoming a sauna, or an oven. I'm sure you get the drift. The heater is on the bottom of the evaporator coils and the defrost thermostat sits on top of the evaporator coils. A continuity test can be done ona the defrost heater and when there are only the two wires and there is no connection point to do the test i always like to keep two sewing needles that i use for this test. Simply thread each needle through the half of the wire not all the way though to the other side and you can use them to perform your test to assure that there is continuity in the thermostat if there is not then replace the thermostat
Some defrost heaters are a coil of wire in a glass tube under the evaporator coils,older ones are just a curved piece of metal that wraps under the condensor. Works like a light bulb basically. The other style looks like the bake element in your stove. They both get red hot either way and melt the frost.A continuity test can also be performed to assure that the heater is functioning properly as well. Simply go to each side of the heater and do your continuity test
Some dont consider this to be part of the defrost cycle but if the fan is not working then the air is trapped inside the freezer and sometimes can cause the same ice up situation which is why I say to always look at the fan first
you can also do an ohms test between terminal 1 and 3 on your defrost timer which will tell if the motor section of the timer is good then you can check between terminals 1 and 4 to by doing a continiuity test which is to the compressor and tells the compressor how long to run if you turn the timer till you hear the click it goes into position to and you can do a continuity test on the heater between terminals 1 and 2 and then you can do a continuty test on these two terminals as well And here is a guide to how your freezer defrosts and some ways to test each piece to assure that they are working in proper order
please remember to rank how this opinion has helped and if you have any further questions message me back Thanks Rick
Feb 11, 2011 |
Kenmore 55609 / 55602 / 55604 / 55606 Side...