Fan oven wont work convection works - De Dietrich Ovens

First reset your breaker, then check your wiring in the back of the oven. You may have just a wire loose.

f the oven doesn't heat and the on-off light works, test the appliance controls, motor,
and heating element .

It would seem that the oven is small enough that a fan to flow the heat from the unit would be in use for both convection and bake modes. Usually convection ovens will have a "burst" of fan action during the bake process and it is not a steady fanning of the air that would dry out your cookies, ect. I have a small oven / microwave and my larger oven is a GE that has the "burst" convection that I described. Might not be that much help, but it's hard without more info on your unit. sometimes the model is behind the oven door.

You need to replace the oven fan element, as there is probably a seperate element in use when used on convection heat.
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ensure that your convection fan is turning
a hum on this model usualy means that the convection motor can seize up a bit
sometimes all you need to do is redjust the fan blade

Bake and convection bake settings both use the bottom bake element to heat. It would be unusual for bake to work without conv. bake working. You also have pure convection which uses a different element surrounding the conv. fan on the back of the unit. If you press a feature and nothing happens it's the touch pad. If it comes on then turns back off it's probably the ERC (clock). If it comes on and wont heat only in pure conv. possibly an upper relay board or element problem.

If it is fan assisted then check the fan element, it is located behind a panel at the rear of the oven compartment.
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If the oven is electric and fan assisted,then I would suggest that the oven fan element is faulty.
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make sure you have selected convect bake, otherwise remove oven from wall to acces the back and test voltage at the fan, most likely the fan is bad, if you use conv. bake alot

the ring element may have blown. if it works ok with the top and bottom elements, (the convection oven) then it is likely the element surrounding the oven fan.