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Heating system failing but boiler ok??

My thermostat is reading 17, and having been set to 20, the heating should be on. A flame is showing on the thermostat, so signal should be going to boiler. The boiler is at the correct pressure, the hot water is working, but no heating! Everything appears to be ok, but the house is getting colder!! Any help would be very much appreciated.
Suzanne, December 2009
what type of boiler do you have? and is the stat wireless?

steve baxi, December 2009