Most modern refrigerators do not have defrost timers anymore. Instead, the main control board controls all of its functions. Older units would have a timer,much like a clock that would defrost every 6,8,or 10 hours if it needed it or not (some may have had a different time but these are the most common). With the main control, it will typically defrost every 8-10 hours of compressor run time. This cuts down on the cost to run it since the defrost cycle uses the most energy.
I am not sure why you are looking for this? you did not say what problem you are having but the main board is in the back, bottom right when you are looking at the back. You will see a rectangular metal plate with maybe 10 screws.
SOURCE: freezer freeze up
Your model TFX20JRBKWWW uses a defrost timer part number WR9X489 located behind the light shield in the fresh foods compartment. (top back area). Just in case you need to know, the defrost heater is a part number WR51X10101 located behind the back wall of the freezer.
SOURCE: Maytag PBF 2255 HEW refrigerator defrost timer location?
These look like schematics that might help you.
http://www.partselect.com/AdvancedModelSearch.aspx?ModelNum=PBF2255HEW&mfgModelNum=&fkMfgID=1
SOURCE: Ge Profile Top freezer-not cooling/not freezing
Evaporator fan motor inside the freezer is working? Any frost on the freezer back wall?
This is the fan inside the freezer section, it will circulate the cold
air around in the freezer and blow the cold air from the freezer into
the fresh food section, it also sucks the warm air from the fresh food
section back into the freezer to be re-cooled.
Hot condensor coils ( under the refrigerator ) been cleaned recently?
**GSS25LGMA**
That is part of a full model#.
Evaporator fan motor
SOURCE: Fridge warm at top cold at bottom
If the fan is no coming on inside the freezer this will need to be fixed soon. Both fans upper and lower must run while compressor runs. Inside the fresh food compartment close the damper on bottom left side next to the paned drawer. If this does not help send more cold air to the top let me know as there could be something else causing the dampers not to open and close properly.
Thanks, Sea Breeze
SOURCE: locate defrost sensor
Remove all of the racks and drawer from the freezer, take the back wall off from the inside of the freezer, defrost limiter/thermostat will be attached to the evaporator near the top, it will be a metal cylinder with two wires coming out of it. It opens on warm and closes on cold
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