I assume you've referred to your owner's manual to be sure you are operating the convection properly?
If for some reason you don't still have your owner's manual, you can get it
here. See the tips on page page 30.
You can also do a hard reset by unplugging the oven for a couple of minutes, plugging it back in, then setting the clock and trying again.
If it's still not working, you may have a bad sensor or other problem.
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