Hello there,
When you are experiencing ice build up in your refrigerator, it simply is due to a faulty defrost unit. The defrost unit is composed o9f the defrost timer, defrost thermostat and the defrost heater. Once the freezer is building up ice, the defrost unit turns on the heater, then the defrost thermostat turns off the compressor while the defrost timer, settings the routine timing for the activity.
Once a component out of the three develops a fault, the routine is stopped and then ice begins to build up in the back of the freezer or at the bottom depending on the type of refrigerator it is.
The solution to the problem is for you to have the defrost timer, defrost heater and defrost thermostat tested, that way you will be able to tell the faulty component and replace it with a new one.
To carry out the testing and replacing of these components, please read this tips, it will guide you on testing the components and replacing them.
Defrost thermostat
http://www1.fixya.com/support/r10513592-test_defrost_thermostat
http://www1.fixya.com/support/r10513650-replace_defrost_thermostat
Defrost timer
http://www1.fixya.com/support/r10523722-test_defrost_timer
http://www1.fixya.com/support/r10523742-replace_defrost_timer
defrost heater
http://www1.fixya.com/support/r10523771-test_defrost_heater
http://www1.fixya.com/support/r10523754-replace_defrost_heater
Hope this was helpful to you.
All the best.
Elect_Comp
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