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