Welcome to the forum md2lgyk. It sure sounds like you have it nailed with a defective closed valve. Either water is not going into the water heater tank, which you can check by taking out the drain plug on the outside portion of the water heater and see if water comes out. Or water is going in the tank but cannot come out due to the other valve being defective and remaining closed. Either way there would probably be an airlock with only one valve open so the air in the tank could not expel out. I know I have to open up a hot water faucet and let the air out so the tank will completely fill up.I`m also not aware of a check valve on the heater tank, but perhaps another member with more knowledge on the water heater tank will chime in. Best of luck and let us know how it turns out.
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2017 Coachmen Catalina 283RKS
2018 Ford F250 Super Duty 6.2l CCSB
2010 Jayflight 28BHS (sold)
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