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no heat to the radiators?

my boiler works triggered by either the room stat or presumably the cylinder stat for the hot water; but no heat is getting to the radiators?

is it the mid postion attenuator valve? which appears to be working visually.
Can you advise.
TG, January 2009
TG is problem could be a few things. ! If automatic values fitted check these. 2 Check water heating pump is working. 3. Dirt within heating system. These would be my first checks.

Chris Plumbing @ Heating NI, January 2009