At controller Initialization, all display elements and LED indicators are switched on for three seconds, the display will then show the software version code for a further 3 seconds before initialization is complete and the normal operating display (Page P00) is shown. In page P00 “normal operation display mode” the Display Field will show the final delivery pressure continuously and the Item and Value Fields will initially show the Information Item display for 35 seconds before reverting to the default temperature display item.