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