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