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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
Do you have the new part? You have to have the cassette out and reach into the opening to attach it. Kind of tricky and not much fun. Not the usual DIY task and most customers decide to have a tech to it. Hope helps some. Get back to me if you need additional input as all follow ups are included in our fee.
See the attached link for some help at Dometic...........https://www.dometic.com/en/se/support/dometic-cts-4110-_-25280
Yours is slightly different, but this video link may give you some insight in how to access the inside of the tank and get to the float. https://www.youtube.com/watch?v=Ry5TmMX3CNk