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How can I resolve the high pressure on my valiant Eco boiler?

Hi. The pressure has but up on my boiler, now in the red. I have had to bleed a radiator to drop the pressure. There is no air in the highest rad. This only happens when the heating comes on. It looks like the system if filling up when the heating switches on!
It's a valiant ecotec. Only three years old!!

Michael
January 2011
can only be one thing expansion vessel either low on pressure or bag has gone

swifty
January 2011

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