Faulty water gauge

We have a Warwick camper built 2008. The electronic display at the door is showing the water level at 100% full, but the water tank is empty. We assume that there is a float in the tank which has got stuck at the top,hence the faulty reading. Any suggestions how to get it free? Thanks

I think you'll find it's not a float but electronic sensors at various levels up the wall of the tank. If you search for tank guage you'll find previous postings on the subject, here's one to be going on with..

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