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