While you wait for answers, we may have found some information which could help you.
Click here for Boiler Pressure Potterton
Gas boiler fails to fire and safety cut out has switched in?
How do I get pilot light on Potterton Profile back on?
Potterton Lynx2 boiler?
Boiler wont start up, indicates fan / flue fault by LED?
boiler airlocked?
potterton performa 30 HE?