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Model Number: HEI7282U/09
Brand: Bosch
Age: 6-10 years
Our Bosch HEI7282U/09 oven has started taking a very long time to preheat. The oven indicates that it is preheating and shows temperatures below the set temperature. I've confirmed that the temperature display is accurate using a high quality thermometer. I turned off the breaker to the oven for over a minute to reset it and the problem persists. I've tried to use both bake and convection bake and experienced the slow preheating.
I cannot find any tech info on this unit so the below is a guess
On most units the bake and broil elements come on during preheat.
On some both come on but on most they switch back and forth.
So it could be one of them is bad.
They also switch back and forth during a bake cycle. This ensures an even temperature profile in the oven.
A symptom of a bad element is that things like cakes do not cook evenly re: burned on the outside and raw in the center.
You may be able to see them get red during preheat but this may not be easy to see so you may have to check them with a meter.
Unplug the stove.
This is very important because on most units there is still voltage to one side of the element even when it is turned off.
Undo the screw/s holding the element to the back of the oven.
Carefully pull the element into the oven.
Remove the wires from it and check it with a meter.
Should be around 20 ohms.
It is a good idea to clip something (clothespin etc.) to the wires so they do not disappear into the back of the unit while you are checking the element.
Thanks! The convection element was bad (read open on the multimeter). New element has it working like a champ.
Quote:
Originally Posted by denman
You are welcome.
Glad to hear you found the problem and are up and running.
Bosch must also use the convection element during preheat.