[Richard L]

Sorry Jsti07.

During the startup routine, if the system detected low tank level, it will not allow the system to switch on, the yellow water level led will be lit on the gauge to warn you.

You can either fill yopu tank up or unplug the blue harness to reset it, but it will only stay on for 20 seconds and go back to sleeping mode.

It is better to fill the tank up.