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