I have a Kantleak (which does!) and have the same problem as the OP.
When I purchased the RV in Nov 2019 and connected to city inlet and the switch was on “city fixtures” all appeared fine. The FW tank didn’t get filled.
I winterized (turned the switch to “winterize”). Then dewinterized for this trip to FL. The stays in parks was fine. When we got to FL and parked in BIL’s yard and connected to his water, things went awry.
“City fixtures” gave us water at the faucets AND filled the FW tank to overflow and forced water out the overflow valve at the tank’s top. So we Amazon primed a new valve. Replaced it and it worked fine for a day or so... Then the FW tank overflowed again.
I called ABCO and explained that I am an “unhappy camper.” I ended up buying a new complete panel from them. We’re waiting on it to arrive.
I like the idea / setup that the Kantleak does. But man, it’s a POS!
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