Difficult without a Model. Electrolux make about a thousand dryers!
To reset your Electrolux dryer,
press and hold the "temperature" and "dryness" buttons simultaneously. Keep these buttons depressed for at least six seconds to reset the machine. If this doesn't clear your error code, you likely need service.
Videos as well
https://www.google.com/search?q=electrolux+dryer+reset+button
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