Used our rv 3 weeks ago no issue. This weekend we take a trip and the hot water is not coming out of the faucets or shower. The heater is working and tank is getting hot. I drained the tank today and ...
Hot water outlet on WH Tank (top connection) most likely has a check valve in it (unless you have a hot out shutoff valve)
That check valve is a cheap plastic plunger/spring/o-ring assembly and when they fail (clog up from calcium/scale or o-ring gets dislodged) no hot water flows out of WH Tank