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