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Optima failing to fire up?
Why do my TRV's rattle?
how can i fix my ferolli optima 701?
OPTIMA 701 Ferrori heating problem?
high pressure when heatings on?
Pilot light will not ignite?
Big bang on ignition?
how can i fix boiler?
optima 701 pressure rises when heatings on drops when off?
Why does the Hawk II Optima keep turning on central heating without request?
Trianco Optima Boiler Programmer Fault (QA73)?
how do i depressurise a ferrolli optima boiler?