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