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