First trip of season and no hot water. Water in tank is hot but not getting to sink/shower. I think it is mixing valve. Any hints on how to fix without replacing. I did check all faucets closed. D...
Sounds like the check valve on outlet side of HWH is bad/stuck. The inner workings of these valves are cheap plastic and fail frequently. Unfortunately, the valve must be removed to repair/replace. This is not a big job if you have clear access to the rear of the HWH.