Is this the micro switch fitted to the front of the diaphragm chamber? (bottom left), if so you need a new plunger seal, easy to do, unscrew micro switch, turn off mains water inlet open hot tap to release pressure, (non need to drain heating side), unscrew plunger seal nut, remove old fitting and screw in new one, open mains water refit micro switch and hey presto! all done.
www.elanar.co.uk
August 2009