I have a double oven Jenn Air where the top oven works fine, but the bottom oven generates a code "Fr" whenever you try to use it (hit bake, enter temp, it seems to want to start working then stops and beeps with code Fr (at least it looks like a lower case R).

I ordered and replaced the temperature sensor which did not help. A useful sign that both the old and new sensors were working correctly is that when the sensor was disconnected, the cabinet fan (not convection fan) on the oven turned on (like the oven was hot).

Anyway, it looks like I still have a problem which is now pointing me towards the relay board. Unfortunately, there are two relay boards listed in the parts so I don't know which one to order (I'm leaning towards the "lower" board since that's the oven having problems).

So my questions are: a) is replacing the relay board the right thing to do at this time and b) which relay board should I replace?

Thanks in advance for any help you can provide.

I just replaced the clock programming board so the display is now working. I have same issue as this post described (very seldom used) lower over not heating. I can now see the error code "Fr" when I enter temperature and hit 'Bake'. There is short pause then error comes up. Should I replace the 'Long Oven Sensor' or 'Relay Board' as first try. As I mentioned, the lower oven has very little mileage on it and has intermittently worked over past few years, but we just stopped trying. I already did a 'loose wire' check on the relay board without success.

Thanks,