There is no hot water in the bathroom in the master bedroom, what the reason.

Don't you say that you turned it off, how can there be hot water when it is turned off, can't you just open the valve again, and then replace it with the hot and cold water faucet. Because you're a tube that's connected together.

The temperature of the heat exchange surface of the water heater is very high, and there will be scale when the water flows through, and after a long time, there will be a lot of scale attached to the inner surface of the heat exchanger, which will accumulate over time, resulting in the blockage of the hot water pipeline, which will cause the amount of hot water output to become smaller (the phenomenon of small water pressure), and the problem of not being able to produce hot water.

It is recommended to clean and descale first, and then inject descaling agent into the water heater to clean the inside of the water heater, and then clean it regularly in the future, when this problem can be avoided again.

This is very simple, the hot water valve you turn off controls 2 water pipes, one for the basin and one for the master bedroom.

It's a bit troublesome to solve, depending on whether your pipeline is bright or dark, it's easy to change the light, and you have to knock on the wall if it's dark, and there is a simplest way, which is to install a valve at the hot water pipe inlet of the basin. Turn this valve off and open the main valve.

You plug the turned off hot water outlet with a plug and open it again.