5.4 Cu. Ft. Stainless Front Control Electric Range With Air Fry

We bought this last January but never got to use it until June 2023 as we were building our house. Since moving into our house in June, this range can't keep the oven temperature that we select. We've tried turning the oven temp higher when the oven has already met the temperature that we select and the oven temp always goes back to 200 or less. This oven is never hot, and it takes an hour to cook fries we've tried air fry, bake, convection bake and it always takes an hour and sometimes more to cook fries. We've cook/baked other things and it takes longer than what it should to cook. This oven is never at temperature.

I bought this oven about 2 years ago, it always had random F16 errors but they were infrequent for the first year. Now I'm out of warranty and the errors happen 50% of the time the oven is turned on. I also get random beeps and errors when the oven isn't even in use. I've had several times when I have to get up in the middle of the night because the oven starts beeping with F16 errors. I've already replaced the relay board out of pocket and today I've replaced the assembly board and I'm still getting errors. This has been such a disappointing purchase.