The pre heat is taking a long time over 30 minutes

have controller checked

I have a Kitchen Aid convection wall oven. It takes 6 - 7 minutes to preheat to 325 degrees. You probably have a bad element. There are 2 elements.

look for the temperature sensor inside the oven cavity in the upper left or top center of the upper oven cavity,its will be a silver or copper colored rod about 1/4" by 2" to 6" long this rod senses the oven temp and cycles the heat to the oven

Hi,
If your electric oven is taking too long to heat or just not heating up right,then check out this tip that will give more detail about your problem.

Oven Problems Electric Oven is Heating Slowly or Poorly

heatman101

To pre-heat an oven is to simply turn it on to the desired temperature and wait 5 to 10 minutes. If you have a timer then set the timer for the desired time you want to pre-heat then begin baking as usual.

There is no magic to pre-heating an oven and everyone that bakes has a different opinion.

Hi,
If your electric oven is taking too long to heat or just not heating up right,then check out this tip that will give more detail about your problem.

Oven Problems Electric Oven is Heating Slowly or Poorly

heatman101

A weak oven ignitor will cause this problem. even though it eventually lights the temp has dropped considerably so you don't get consistent temp. turn the oven on and listen for the burner to light. should light within about 2 minutes. if not replace oven ignitor(s)

if its a gas model most of the time you will have a weak oven ignitor. if an electric,check to see if the bake element gets hot ,some ovens will bake with upper and lower elements so if only the upper works it will take much longer to pre-heat.good luck!

If you need further help, I’m available over the phone at https://www.6ya.com/expert/dude_653d05454b389bba

check your power connections, do you get 240 volts between red and black, 120v red/black to white? at outlet and in unit