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Central heating air returns after regular bleeding?

I regularly have to vent one upstairs radiator. It's a fully pumped system with a two-way valve CH/HW. Header tank is full, so I am puzzled where the air can be entering on such a regular basis ? All other rads and HW are fine.

Duncan
January 2007
Heating, Home Heating SystemsCentral Air Radiator
Many thanks ... would raising the vent pipe by approx 30cm (max distance to roof) be likely to help significantly ?

Duncan
January 2007
can be taken in through vent pipe

hi-spec plumbing
January 2007

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Central Heating Air: Frequent Bleeding - Why?