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