The Water ON/OFF LED is red
Edited
This might be due to air bubbles in the system causing problems with detecting water flow. An easy way to remove air is by turning the water on max flow for 30-60 seconds.
You can often hear the sound of air flowing through the pipes when the water is on.
Sometimes, a de-airer might need to be installed by a professional for the proper functioning of the water piping system.
Ask a plumber or expert for help if you feel uncertain.