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