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