Central Heating will not switch off

3 Oct 2007
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United Kingdom
My central heating will not switch off although the heating thermostat and programmer are switched to off ie pump/heating carries on,just started today. If I then switch off the mains and switch on again then the pump will finally stop. When I start the heating again for a short while and then turn thermostat down and programmer heating and water to off the same thing happens again.
I have Glow Worm 80FF / Danfoss HSA3/ Danfoss cp715.
Any suggestions please.
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It might be running on a frost stat :idea:

You say glow worm 80 ff ..... Is there a model name ie. ultimate, micron, express etc
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I have never bothered about the frost Stat which I find is situated on outside garage wall and with a Honeywell l641B on boiler pumped return pipe. Is problem caused by colder weather?

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