Hi Chris,
It sounds as if the down arrow button key is stuck on the touch panel itself. Essentially the oven thinks you are constantly holding down the down arrow. Likely the button is shorted out which is the cause of the fault.
You can test this with an Ohm meter to check for continuity between the various pins on the ribbon cable that connects the touch panel to the ovens main control board. Depending on the model the tech sheet will sometimes include this test information, but other times it won't.
Basically you you connect your meter clips across the appropriate pins on the ribbon cable, press the button, and you should then have continuity. If that buttons ribbon cable combination shows continuity without having the button depressed - that particular key is shorted.
This is not the typical DIY test as it's fairly involved and the ribbon cables are extremely fragile so proceed with caution.
Of course, be sure to unplug the oven or shut off the breaker before attempting any repair.
Another thing you may try if you haven't already is leaving the breaker off for 15min and see if the problem persists. It's always a good first step, but it usually does not good in this particular scenario.
I hope this information helps some.
If you need further help, reach me via phone at
https://www.6ya.com/expert/andy_cb7b2db03098fe36
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