Remove bottom panel by removing single screw & control knob and slide forward. Wiring diagram should be on reverse of this panel. Main case is held on by two screws at top and two matching screws on bottom. These are BEHIND the electical panel, which should be ISOLATED AT MAINS before touching. Spares may be available here: http://www.heating-parts.co.uk/ProductByGroup.asp?PrGrp=55
simon
February 2008