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