No hard and fast rules can be stated but, 'ON/OFF' switch on the control panel to the. 'ON' position. The external pump will run when the taps are.Batteries: installation and connection ! DANGER! Check that all switches on the control panel are in the "0" (off) position. Make sure you Nordelettronica has taken special care in developing the 4.3” high-contrast color dis- play, which features attractive graphics with a high aesthetic impact. CONTROL PANEL NE152 Fig 2 CONTROLS: Button with indicator light to start / stop INTERIOR NE 152 manual here, in French but google translate works!