on some models the on/off switch has a reverse action on them meaning when you turn the button to the O postion you can turn it left slighty which is the reset switch if it is hold for five sec then turn on boiler .
hope this is ok for you.
cantona
October 2010
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.