JennAir oven temperature fluctuating. Model JES9750AAB

[LukeM]

Our down draft oven has given us temperature issues since we bought our house in May. I've replaced the temperature sensor twice (once with a cheap one and today with a Whirlpool genuine part). I also replaced the bake heating element today with a genuine Whirlpool part. After doing so I preheated the oven to 350 and measured the temperature using a Weber grill thermometer for 2 hours. The measured temp fluctuated from as low as 326 up to 360. The oven never held temp near 350, it seemed to drop to around 330 before cranking up to 355 and shutting off the heat element again. I was wondering if there were additional parts to check for replacement or maybe a way to recalibrate the oven temperature. I'm sure all ovens fluctuate but this seems excessive and makes baking rather difficult. On top of that down draft ovens appear to be uncommon and are expensive to replace. I've attached a screenshot of the temperature sensor as well.

Thanks for any help!

[16345Ed]

Oven functioning as designed. They average the set temperature. They can’t stay at one temperature. 
 

Element cycles on and off trying to maintain an average. 

[16345Ed]

The first step to fixing appliances is knowing how they work. 

[LukeM]

Thanks for your answer and information. Given that the set temp was 350 and that is definitely not the average in that line graph, do you think it's worth trying to adjust or calibrate the oven?

If it's set for 350 I wouldn't see an issue with the oven cycling between 340 and 360. But since it was more like between 330 and 350 I was wondering if there was anything I could do to adjust the average 

[vee8power]

16 minutes ago, LukeM said:

But since it was more like between 330 and 350 I was wondering if there was anything I could do to adjust the average 

That's an average of 340°.

You could bump the calibration up 10° using the instructions in the user manual or set it at 360° when you want 350°. Ten degrees isn't much so I would look for other issues like frequent door openings or a bad door seal. 

I have been wondering if a temperature logger with a range suitable for an oven exsisted. Thanks for the tip on the Weber!

[16345Ed]

When calibrating we throw out results of first cycle. 
 

I bet you do that you are real close to 350. 

[Nathaniel Peterson]

2 hours ago, 16345Ed said:

When calibrating we throw out results of first cycle. 
 

I bet you do that you are real close to 350. 

Exactly 

[LukeM]

Thanks everyone for the help. Seems like I was trying to fix a problem that didn't really need fixing.