Can anyone help please. My potterton profile will not fire up. The problem is I am getting no supply from the PCB to the main gas valve, Pump runs- Fan runs - spark ignights the pilot - pilot stays alight. I have checked the function of the main gas valve by piggybacking suply from the pilot gas valve and the boiler fires up and operates OK but this leaves the main gas valve permenatly open. so bad idea. I have changed PCB but problem still exists. Any ideas?
thanx
thanx