Is the heater timer on ge refrigerators with computer boards, locayed in the computer board? does the whole board have to be changed also? the heater and the thermostat have been changed but, the evaporator coil keeps freezing up.

Before replacing any part make a thorough check of the heater, freeze sensor, and the defrost timer coil or contacts. If contactsopen and closes when you rotate the timer manually, contacts are okey. If the coil have no resistance, it is defective. Replace the timer by unscrewing the two metal screws holding the timer. Make sure to install the terminal lug clips to the correct location and rescrew the new defrost timer. For heater, remove the terminal clips and remove the clamps holding the heater. Install the new heater and fix the desired clamps then connect the terminal lug clips. Freeze sensor should close contact when frozen. If the sensor does not contact when frozen replace the freeze sensor.

Doesn’t have a timer. It has a control board located on outside back wall behind a metal plate. Heater is located behind a removable panel on inside back freezer wall. Has to wires going to it and 2 screws that hold it in place

Are you sure all of them went out? It's very unusual to lose all 3

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

sometimes the timers are located inside the fridge side by the light or on the electronic board in the back of the unit depending how old this is.

Hi,
Sounds like a defrost timer/control board issue...

Check out these tips...they can help you figure out what is going wrong with your refrigerator and why it is not cooling

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heatman101

That is a key sign of a defrost problem. GE has a defrost timer located at the upper left side of the ref . At the same time GE has glass defrost heaters that are behind the freezer wall tat will burn out. My personal advice would be to change out both the heaters and the control board to save yourself the headache of going through this again. The part numbers are :wr51x0344 for the heaters and wr09x048 for the timer. You can order these parts at APDEPOT.com

If you need further help, I’m available over the phone at https://www.6ya.com/expert/jason_4570d45317834dd3

Change your defrost timer,,,,,or if it is controlled by a circuit board then change the board out.

http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php
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check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

This model does not have a defrost timer. It has a motherboard. You must jump out the plug to the main board to test the defrost circuit. In order to do this take the cover off of the main board, find the three wire connector on the base of the main board, connecter is normally blue in color. On the board itself it will identify termials as line, defrost, and compressor. To test you must create a jumper wire.Install the jumper in the plug terminals identified as line and defrost.This will turn the defrost heater on. If the heater does not come on, look for a defective heater or a defrost thermostat(mounted on the top of the evaporator). If the heater does come on replace the thermister(located on top of evap, white in color and has two white wires part#WR55x10025)