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Fixing my Ideal response 120?

I have a Ideal response 120. Since the temperature has dropped below freezing my heating comes on of its own accord. I have tried switching it off using the central heating switch or over-riding it but it will not switch off. Its costing me a fortune please help????
Joanne, December 2010
Just a thought, is there a frost thermostat fitted?

Carefree, December 2010