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Unfortunately you're not doing anything wrong, the logic in the display board is just corrupt. Try to unplug the range for 5 minutes to see if the electronics will reset. If that doesn't work the display board is just faulty and it's no longer made so if you wanted to fix the issue you'd need to send the old board into a place like Appliancetimers.com to have them refurbish the board which costs about $150-200 and takes about 2 weeks.
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