My solution was to leave pump on, turn off park water, then pump water off. Turn park water back on to re-set water pump check valve with at least 50 psi water pressure.
I’ve had this issue for two years on 2017 Tour and even had water valve replaced with no luck. It seems to work if you do it with each step as I mistakenly pressed water pump switch early one morning by mistake while hooked up to park water and fresh water tank filled during the day. Went with switching as mentioned and have had no additional issues.
2017 42QD Tour
2018 Canyon Toad