Check in the freezer be hind the back panel for an ice build up.
If there is an ice build up the defrost cycle is not working.
This can be caused by the defrost timer, the defrost heater or the defrost thermostat.
The defrost timer is located in the fridge section in the control panel.
There will be a knob between two screws.
With the compressor running turn the knob on the timer until the compressor shuts off.
The fridge will now be in the defrost cycle.
If the fridge defrosts the heater and thermostat are good and the timer will have to be replaced.
If the fridge does not defrost check the heater and thermostat that are located in the freezer section.
Here is a link to your fridge model tbk21.
Check on the model number tag in the fridge section for the rest of your model number.
Last edited by PS Staff - Sheila : 08-21-2007 at 06:24 PM.
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Refigerator Repair 
