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