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