While you wait for answers, we may have found some information which could help you.
Click here for Boiler Heating FaultMy potterton boiler keeps losing water pressure and condens?
Potterton Prima 30F?
potterton 16/22 pilot lihght out?
How to replace Potterton EP 3002 with EP 2?
Potterton Prima 60F- can you start it manually?
Potterton ep22?