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How can I fix my Potterton Profile 50e control system ?

When Potterton Profile 50e controller is set to 'off' , the boiler still runs .Is the wiring circuit damaged ? Building work is taking place adjacent to the boiler.
Can you show a wiring diagram which includes a froststat.
Gerry Woolnough, May 2005
the frost stat has a perm live that overides the prog/controler so if that is exposed or has been ajusted during builging work it could cause the boiler to kick in

d.., May 2005
link Click here to see other fixes for Potterton.