Hi Fred,
The "F2" means the oven control senses runaway temperature and it has nothing to do with the touch pad.
The cause of the problem could be the oven sensor, the oven sensor wire harness or the power relay board.
Open the control panel and measure the oven sensor resistance at the control board. It suppose to be about 1100 Ohms at the room temperature.
If the reading is wrong do the same test at the oven sensor connection (where the sensor wires goes through the back panel).
If the reading is still wrong - replace the oven sensor.
If the reading is correct, check the wire harness and the connector itself (it's better to eliminate the plastic plug and hardwire the oven sensor).
If there is nothing wrong then the power relay board has to be replaced.
- The part number for the oven temperature sensor is
AP204836
- The part number for the power relay board is
AP3970864
Here are the break down diagrams for the Jenn Air oven
Model W156W
Gene.