I am getting an f3-1 error on my jennair gas range JGS8850ADQ, only after 15-25 minutes of baking. The error code stays activated for at most 2 hours after turning the oven off. The oven sensor tests fine, both at the sensor and at the electronic control (through the harness) at several different temperatures, not only room temp. The cooling fan works, but seems to run very rarely, and there is a lot of moisture around the display.
I tried forcing the cooling fan to run continuously (gave it power with a separate power cord) and then about 10 minutes into baking the display was saying 400 degrees and the oven was at 200 degrees. However, the resistance of the oven sensor was correct, at the 200 degree equivalent resistance. I did not get the typical f3-1 error I would have otherwise.
I tried removing the whole electronic control assembly, and propping it up outside so it wouldn't get so hot, (rewired the cooling fan normally) and then I had the opposite problem - the oven temp was 400 and the display said it was 250. I measured the oven sensor resistance at the electronic control and it was, again, correct for the temp of 400, but didn't agree with the display. I turned the oven off and on, and then the display was correct. I did not get the typical f3-1 error this time either.
If the oven sensor tests ok at several temperatures, could it be going bad intermittently? Could it be the problem? I have to unplug the oven to test the resistance, is there something that makes it not work when there is power, but work when there isn't?
When should the cooling fan run? Does it have its own thermostat or use the oven sensor?
Why does messing with the position of the electronic control change what it thinks the oven temperature is?