I had something similar last year and then realized I needed to use the multi rack option for heating if I was heating up more than one item. Have you tried that?

Thanks for your response. :)

I have used the multi-rack option in the past with cookies, and it worked fine when I needed it.

This heating issue is usually with just one item. It seems to be more prevalent when I go over 30 minutes of baking time, but not always. It is very irregular. The technician last year also suggested that I videotape what I do/try so I did do that this Thanksgiving week. There is really no rhyme or reason to any of it. One time it works/next time, no. And it does affect top and bottom ovens--convection and regular baking modes, but not all the time. Sporadic failures.

Sounds more like a bad temperature sensor than a bad motherboard. Something has to send readings to the motherboard. How has the oven been cleaned? Could it not be seated fully?

https://partsdr.com/part/00642855-oven-temperature-sensor?gclid=CjwKCAiA58fvBRAzEiwAQW-hzbyE0Dq0W4wcduN0q9Wuz5d8gYHjXtrhVGZspsCBrZAnvSZvrb-2BRoCxCoQAvD_BwE

Honestly, it hasn't been cleaned--it's not dirty, again, light use.

I don't know anything about how it is seated--I do know that the tech pulled it out, put it back and said everything looked good.

I believe they went down the route of motherboard because it affected both ovens. Also, the keypad always reflects what the temp should be and doesn't show that it is not up to the correct temperature.

Sorry I am mechanically clueless--but I did always feel that the "motherboard" was not the accurate diagnosis. But how do you argue with your tech and the Bosch tech? The Bosch tech was the one adamant about the diagnosis. My in home tech was puzzled because he felt that the oven looked/acted correct always and nothing would ever come up in diagnostics. It always worked perfectly when he was here. It just made me look crazy. lol. That is why I videotaped it the last time--to have proof. :)

I saw the link--wouldn't that be even nuttier, if it was such a simple/inexpensive fix. Ugh!

Thanks for chiming in!! I appreciate it.

It’s a super simple DIY attempt at a fix. And it’s a common issue with many ovens. I’d at least attempt it rather than calling a service tech back.

This seems to be what I see when a hidden bake element fails.

During preheat the oven mostly heats using the broil element. After preheat the bake element becomes the primary element and the broil element only comes on for short cycles to aid in browning.

If a hidden bake element fails this means that only the broil element is working and the short cycle of the broil is not enough to maintain the heat in the oven. This means the oven temp will fall off about 150 degrees.

Jakvis,

Thanks for weighing in! Is it possible that both the top and bottom ovens would have this issue? I mean, it would be two bake elements, right? Each oven would have one?

A loose connection in the main harness could be the culprit and cause both ovens to react similar.

Thanks for your extra advice!

I made another ham yesterday. I was able to get it baked by turning the oven off and on about 7-8 times. It seems that once it reaches about 15-20 minutes at temperature, it begins to fall off.

Turning it off and on resets the preheat mode which is mostly the broil element doing the heating. Again this is indicating that your bake elements are not working.

Thanks again--it sounds like an easy fix. Why they went down the other route, I'll never know?

Thanks again to you and Live Wire Oak--you both are such assets to the Gardenweb!

If you have a tech come again the only way to properly diagnose this is to pull the oven completely out of the cabinet and check the power coming to the elements themselves and then trace backwards if they don't have power. Could be something as simple as a high temp cutout or similar.

Thanks again--it will be after Christmas, but I will let you know what they find!

Did your issue ever get resolved with your ovens?

Good to see that it finally did get resolved in a satisfactory manner but unfortunate it took so long and the frustrations built so high. Situations like these is where manufactures lose customers and potentially would be customers as well.

Mom2sulu - can you please clarify - when you said you got a replacement oven, is it the same make and model? Or a different brand altogether? Or still a Bosch but a different model? Thanks!

We replaced it with the exact same model--the 800 series Bosch double ovens.

Honestly, it came down to sizing. It fits our custom cabinets perfectly where other brands would have required some additional adjustments.

Also, I scoured the reviews for these ovens, and it does seem to get overall great reviews. We just figured we got a lemon initially.

Mom2sulu, your Bosch double ovens have the lights in the upper left and lower right of the oven cavity pointing out towards you... does it have lots of flo are if trying to look in on food with the door closed? I am deciding between the 800 and the benchmark since the benchmark lights are on the side walls vs the back wall. Not sure it make any actual difference.

Bosch wouldn’t let you go up to the Benchmark for the replacement?

Honestly, we didn't ask for the Benchmark--we were just happy to have anything new at that point especially considering that really thought we were going to be entirely stuck with totally replacing it at our own cost.

Are you asking if the lighting is adequate--couldn't tell from your post? If so, yes, it is good--no issues with that.

Sorry autocorrect messed up my ask. I was asking if there is glare coming from the lights because they are behind the food facing directly out at you.