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