Had water leaking from the roof where the hot water pressure release pipe is. Had the plumber change the washer. We turned down the water to lower the house water pressure. Now my hot water tank doesn't get hot, just wonder if that's the problem

Hi Smarty

What kind of water heater? If you have an electric water heater then I would check the electric fuse/breaker first. If that looks OK I would check the thermostats and finally the elements if needed.

Mark