What's wrong with cold water without hot water?

Suddenly, the water heater can only produce cold water but not hot water. What is the reason? What should I do? A few days ago, there was a sudden situation that there was no hot water but cold water in the water heater at home, but I saw that the water heater was also electrified and heated. Why is there still no hot water coming out? I can't figure it out. Later, I checked it carefully and found that it was this reason. What is the specific reason? I will tell you in detail below!

The water heater can heat normally, and the temperature shows normal, but it does not produce hot water.

At that time, Bian Xiao turned on the tap, including the water spilled from the shower, which was cold water. The water heater has been heated to more than 60 degrees, which is also the normal temperature. According to normal use, it should be able to produce hot water, but Bian Xiao turned the valves of shower and faucet to the hottest direction, and the water produced was still cold water. After careful inspection, I can't find the reason.

Finally, guess what the reason is? It turned out that the cold water valve of the water heater was closed, resulting in hot water in the water heater, but it could not produce hot water. The reason is that the closed water heater is a pressure-bearing mechanism, and the pressure-bearing liner needs external pressure to generate hot water. Generally, the hot water of water heater is driven by tap water pressure. If the water inlet valve is closed, the water inlet valve cannot feed water, cold water cannot enter, and the water heater cannot generate hot water.

Another reason is a protection mechanism of the water heater, because the water heater can't enter cold water. Once the hot water is turned on and put in, there will be no cold water in the water tank of the water heater, and the water heater will definitely break down when it is dry. To put it bluntly, it is a safety protection mechanism when the water heater works. Do you understand now?

Of course, there are other reasons why the water heater can't produce hot water. For example, there is something wrong with the heating system of the water heater, which can't be heated all the time, so it can't produce hot water. The inside of the water heater is too dirty, the magnesium rod scale is too hot to be heated to generate hot water, and the safety valve of the water heater is abnormally damaged, resulting in insufficient pressure in the water tank of the water heater to generate hot water. And the simplest thing is that the water mixing valve is broken, and natural temperature adjustment can't change hot water. This is also one of the reasons!