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