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