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Hello... Can anyone enlighten me what the screw head does at the back middle of the Potterton pressure switch - adjust sensitivity?? (there is a white spodge of paint on the screw 'head' here... http://www.plumbase.co.uk/pot5114748-pressure-switch-10000181-3533446 Also does it matter...

Hello! After years of disuse I've got my Accenta g3 'half' up and running. Zones 1 and zone 2 work a treat (front and back door surface switches) but I've got stuck with the PIRs... Pretty sure it's all wired up correctly but noticed there is no voltage across the 13v / 0v power terminals...