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Thanks Bill. I was aware of black and grey water tank issues (usually with dirty sensors) but was surprised when this happened to our fresh water tank. We're somewhat used to how much water we use when we dry-camp, so don't know that I would upgrade, but I'll keep it in mind.

Thanks for the response. Don't believe its the panel as everything else is working on it. Pulled the fuse for the monitor panel to see if that might "reset" it, but no luck. Also looked for loose wiring and did not find any on the back of the monitor panel. The only reading I get is E, none...

I have a 2016 Heartland Bighorn 3010RE. I was filling our fresh water tank in preparation for dry camping. Once water came out of the overflows I quit filling. Initially the readout on the panel indicated the tank was full, but then the water level dropped to 2/3, then to 1/3, and eventually...