Locate defrost sensor

Your model doesn’t have a defrost timer. It has a control board that controls defrost and many other functions of your fridge. It’s located behind metal plate on outside back of refrigerator usually just above bottom grille. Heater and defrost thermostat are located behind removable panel on inside back freezer wall. Heater will be at bottom of evaporator and thermostat will be clipped on top of evaporator

Check for ice / frosting inside the freezer .... If present you probably have a defrost problem.... This causes the freezer coil to ice up and block the air flow ... the causes could be a bad defrost heater , defrost timer, defrost sensors, or control board. Also make sure that the condenser coil is clean. remove ALL dust with a vacuum and a coil brush .the coil is located either on the bottom or on the back side of the unit... You didn't give the Make and model #

defrost heater is located inside of ref. freezer take out shefs and racks.should be screws on back plate remove plate and derost heateris is normally mounter at bottom of coils .ge still uses glase heaters.google model no. for correct part

The PSS26NSTASS does not have a defrost timer. The defrost on that model is controlled by the motherboard=> WR55X10942 Board Assembly Main Control On your model if not defrosting it will most likely be caused by the=> WR51X10055 Defrost Heater It also does not hurt to replace the=> WR50X10068 Defrost Thermostat
while inside freezer changing out the defrost heater. Click here=> PSS26NSTASS Freezer Components In that photo location 230 is your defrost heater and location 240 is your defrost thermostat. Here is a=> PSS26 Service Manual if you don't already have Adobe Acrobat Reader Click HERE I will be here should you have any questions, Thanks Sea Breeze

HI you have a bad defrost heater, located in the freezer behind the rear panel at the bottom, the part cost around $50-70.00.



Sean

If freezer is icing up, you might have a defrost problem. Frost free models have a heating element that is controlled by a timer to automatically defrost ice, defrost timer turns on defrost heating element every 12 hours to melt ice in freezer and allow good air flow.
You can test defrost element with an ohm meter(located inside freezer coils-will have two wires going to a plug connection), if OK replace defrost timer (located in various places depending on make and model

If freezer is icing up, you might have a defrost problem. Frost free models have a heating element that is controlled by a timer to automatically defrost ice, ie defrost timer turns on defrost heating element every 12 hours to melt ice in freezer and allow good air flow.
You can test defrost element with an ohm meter(located inside freezer coils-will have two wires going to a plug connection), if OK replace defrost timer (located in various places depending on make and model

Replace the defrost heater and defrost thermostat located behind the freezer panel inside the freezer compartment.

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.

I might first suspect the defrost bi-metal thermostat located in the freezer compartment behind the interior panel. It's clipped onto the coils and is usually a little round disk with a couple wires coming out of it. The reason I susupect it is that little device is what "opens" to kill power to the heater once the temps get hot enough to have finished melting the ice on the coils. If that is stuck "closed" or opens WAY out of it's heat range then the heat element will stay on way too long. Next is the actual defrost timer which can be a clock type timer or a circuit board. If you go to this site use GSS22JEM for the model number. Item 240 is the bi-metal, 241 is the thermistor sensor. http://www.partselect.com/Schematics/GE/00113124i06.gif Item 801 is the control board. http://www.partselect.com/Schematics/GE/00113123i02.gif