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Boiler is showing a central heating demand when thermostat is turned down, but the burner was off. Any clues as to why this happens appreciated.

4 bed detached house. Had a chemical flush, new vaillant boiler, manga clean & inhibitor fitted. August 2011. System is pressurised, new cylinder in loft, boiler not combi, rads downstairs on micro bore. Some rads cool at bottom. Boiler now noisy. 4 (3 by vaillant engineers) attempts made to...

I had a new boiler, vailant ecotec 415 in August 11. Had a chemical flush & magnaclean as part of installation and on day of installation. Boiler now making funny noise. Vailant engineer says the water in the system is dirty, possibly too much inhibitor? it's a soft of pale yellow colour and...