Joe beat me to it. Wrote a detailed reply but my ISP lost it. The check valve/backflow preventer on the hot water out side could be defective allowing water to enter the hwh. I am assuming you have a one valve bypass. If you have 3 it literally blocks the water without depending on the valve.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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