Why does this electronic water heater not produce water?

There may be multiple reasons for this problem. The followings are all possible causes and solutions, please check if there is any reason to apply to your electronic water heater.
Possible causes and solutions:
1. The water supply system is shut down or the water pressure is too low. Please check the water supply pressure.
2. The water outlet is blocked. Please check the water outlet or clean the filter.
3. The hot water valve is not open. Please open the hot water valve.