Hi i had the same prob found this on a site called fixya.com and it worked good look . In the top of the water inlet valve at the bottom of the unit there's a plunger that rises when the water is switched on. this activates a small switch at the bottom of the pcb and cancels the low pressure warning. this is free to turn in the valve and over times may rotate stopping the plate on the top from contacting the switch on the pcb. If this has happened just turn the plunger back to the correct position
emily plant
emily plant, January 2010
