Water in water heater HOT but no hot water at faucets etc
Bypass on backside of water heater tank is still open allowing cold water to flow into hot water lines
Showers not turned off by hot/cold knobs.just shut off via button on shower head handle. This allows cold to mix with hot inside the shower faucet
Both conditions above are IF water flows out of a faucet hotside and it is luke warm/cold
IF NO water flows out of a faucet hotside then check valve on WH Tank Hot out has failed and isn;t allowing hot water out of WH Tank