Water Pump issue

I still hadn't plugged the water heater yet. Was waiting for water to flush through. Will plug that and leave water off and recheck all valves and see. Maybe it's just user error! LOL

Wild guess. From experience. Are you filling your water heater? It's the lowest point for water to run out. Especially if you have the plug/zinc pulled.

I have the valve at the water heater, that I turn "up" every year, and then two at the water tank. One stops water from going to the pump or to the left if I want to use the antifreeze tube to fill the lines in the fall. I'm gonna mess with it again on Monday Tuesday when I'm off work. Hard to get to the pump as it's in the basement right next to the water tank. No access that I can tell from above. Gonna check the strainer when I find it. Thanks.

Inline strainer / filter filled with gunk?

Also if you have a 'winterizing' vale it needs to be closed

Turn pump ON
Open nearest faucet HOT side and leave open to fill water heater tank and expel air from system

(Provided WH Tank Bypass is closed ---cold in open, hot out open (if equipped)

On many coaches you have to CLOSE the water fill valve or the pump just recirculates back to the tank.