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Why's heating still on when clock turned off?

Last night, long after the CH clock had switched off the radiators were still on. We turned the dial on the boiler to zero and eventually they cooled down. It's a Potterton Flamingo 50 - does anyone have any ideas?
Alison Melville, November 2005
POSSIBLE ZONE VALVE PROBLEM MICROSWITCH

RAY, April 2007
link Click here to see other fixes for Potterton Flamingo 50.