Rubber button repair
Contact can be degraded by dirt on contacts and button which can be cleaned with alcohol. However, over long periods the rubber can oxidize or break down losing conductivity.
Replacement conductive rubber buttons for all sorts of keyboards and switches are widely sold, Amazon, ebay, Aliexpress etc., electronic distributors.
A variety pack with multiple sizes, ButtonWorx Amazon
https://www.amazon.com/ButtonWorx-remot ... 79QQMP7DTQThe switch could be permanently closed with 2.2K resistor jumper, but the software may periodically demand opening and closing the bin, to empty, before running. This message can be disabled in the LCD Support menu.