Lost Hot water pressure

Ok, I've now tested the water system by turning the valve that is supposed to bypass the water heater for winterizing. I'm now completely confused. Even with the valve in winterizing mode water is going to the water heater. But.... once the water heater fills I now have equal pressure in all faucets both the hot and cold side. Ok, I kind of expected that but here is a real confusing other situation. I now have turned the winterizing valve back off so that water is supposed to go to the water heater and I now have equal pressure on both the cold and hot faucet positions. That is new and occurred after I switched the by pass valve one time. That is really confusing. And... the water pump no longer turns on. The switch lights up but the pump doesn't run. This is got to be telling me something but I sure don't know what yet. Guess .... the pump thinks there is adequate pressure so it doesn't come on. need yo release some pressure when the city supply isn't on and see what happens. But why is water getting to the water heater when I have the valve in by-pass mode? Coming in backwards??? This thing doesn't make sense yet.