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