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