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