While you wait for answers, we may have found some information which could help you.
Success
Message
how can i fix boiler?
how do i depressurise a ferrolli optima boiler?
high pressure when heatings on?
Trianco Optima Boiler Programmer Fault (QA73)?
OPTIMA 701 Ferrori heating problem?
Why do my TRV's rattle?
Optima failing to fire up?
Pilot light will not ignite?
how can i fix my ferolli optima 701?
optima 701 pressure rises when heatings on drops when off?
Big bang on ignition?
Why does the Hawk II Optima keep turning on central heating without request?