The controller shows that the water temperature is not low, but there is no hot water in the bath

The controller shows that the water temperature is not low, but there is no hot water in the bath

The system shows that the water temperature is not low, but there is no hot water in the bath. What's the matter?
A customer in the Baidu business lattice above asked, when the weather is fine water heater control device to display the water temperature is not low, but in the process of bathing no hot water, he is Hebei, not the installation of our company's production brand and other brands.
1. because of unstable water pressure or tap water pressure, the water heater in hot water down;
The hot water valve switch 2. is first observed whether or not open, or the cold water valve off a small or not; if you can increase the water supply valve to increase the pressure of hot water, or the water heater outlet pipe;
3. if this phenomenon occurs in winter, it is possible that the outdoor pipeline is frozen, and it needs to check whether the electric ribbon is started or failed.