While you wait for answers, we may have found some information which could help you.
Click here for Central Heating Water Workshigh pressure when heatings on?
Optima failing to fire up?
how do i depressurise a ferrolli optima boiler?
optima 701 pressure rises when heatings on drops when off?
OPTIMA 701 Ferrori heating problem?
how can i fix my ferolli optima 701?