Get accesss to the rear of the shower taps and disconnect both hot and cold and make surethere is no white crap stuck inside the hot side at the connection point . Maybe take off whole tap assembly and clean out . I bet it is the water heater gunk that is plugging something . Also somehow turn the water pump on while towels wrapped around open hoses to flush out gunk if it is in there.
It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..
2015 White Chev Silverado 2500HD 4x4 (6.0 l gasser)
2003 Mountain Star 890SBRX Truck Camper