WOC54ec0AS04 Whirlpool microwave wall oven combo

[cogoodman]

Hi, I have a microwave/wall oven combo that is less than 2 yrs old, but the temp in the oven never seems to be correct. I first suspected that I had a problem after issues cooking Christmas dinner in 2017. I added to reliable thermometers to the center rack of the oven. The oven made and continues to make the sound that it is at temp when it is more than 200 degrees below it. I looked at the manual and put it through a calibration procedure, but that was only good to adjust 30 degrees and it was off by like 50. I then tried to set it 20 degrees warmer, but it takes forever to get to high temps and then it seems to go to the temp I asked for rather than the one I asked for. When I last attempted to bake bread, it took around 40 minutes to get to 450. I did try another calibration procedure, but I really don’t think it changed it.

Thanks