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