my boiler has been working fine , then last night it stopped heating. The coming throug fine but not powering up to heat. No motor charge, noise or steam from outside vent to show trying to work or in use. could this be the pump or motor - ?? are they easy to replace?? any suggestions? run home business and plumbers all busy with cold snap!

cold bear, December 2010

my boiler did this and it was the thermostate ,just unplug it to see if it fires up

trevor, January 2011