We may have found other answers which could help you.
Click here for Fires Switch ReplacedMy potterton boiler keeps losing water pressure and condens?
Potterton ep22?
Potterton heatmax combi?
How to replace Potterton EP 3002 with EP 2?
Potterton Perfoma 24. Hot water works fine No heating?
potterton 16/22 pilot lihght out?