I have had the water heater bypass valve replaced and now I get only room temperature water out of my hot water faucets. I can hear water going into the water heater and the burner fires to heat the water. When I open the relief valve on top of the water heater hot water comes out but no hot water is getting inside. I have the Anderson valve set to CITY. I'm preplexed as to what is going on. It has always worked before and now it is not.