We may have found other answers which could help you.
Click here for Boiler Heating Fault
How to replace Potterton EP 3002 with EP 2?
Potterton EP2000 - pump control?
Pressure gauge on a Potterton Boiler?
My potterton boiler keeps losing water pressure and condens?
Potterton ep22?
Potterton Prima 60F- can you start it manually?