Why is the heating not hot? What if the heating is not hot?

When this kind of fault occurs, the valve is usually closed before heating, and the water supply and return valves can be opened. If it still doesn't work, the radiator should be blocked. You can find a professional cleaner to clean it.

Gas accumulation. Generally, the indoor heating part is not hot because the air in the radiator is trapped, which is the phenomenon of "air blockage". It is recommended to deflate the radiator.