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