GE Range Error Code F121

F121 means the control board has detected a voltage reading from one or more touch keys on the keypad that is outside the acceptable limits. The fault applies to any key except the cancel key, which has separate monitoring. It typically points to a problem with the touchpad membrane, the ribbon cable, or moisture contamination in the keypad area.

A keypad voltage fault can make the range unresponsive or cause unintended behavior from touch controls, which is a safety concern. It is advisable to avoid using the range until the fault is diagnosed and resolved, particularly if you cannot reliably control the cooking functions.

Repair costs depend on which component has failed. A replacement touchpad membrane assembly typically runs in the range of $50 to $150 for parts, while a new control board can cost anywhere from $150 to $400 or more depending on the model. Adding professional labor charges will increase the total, generally bringing a full repair into the $200 to $600 range.

You can attempt a reset by disconnecting the range from power for several minutes and then restoring power. If the underlying cause is a temporary issue such as moisture, the fault may not return. However, if the touchpad membrane or ribbon cable is physically damaged, the code will come back and a reset alone will not fix the problem.

Start by checking whether any key appears stuck or if liquid may have gotten behind the keypad, and allow the panel to dry completely if contamination is suspected. If the fault persists, inspect the ribbon cable connection between the touchpad and the control board for looseness or damage. A faulty touchpad membrane assembly will need to be replaced, and if the keypad tests correctly, the control board may require replacement.