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Hello, I haven't been able to identify your product from the designation of "s79120c" - please can you tell me the make, and what it is?
I await the outcome with curiosity :-)
I'm not sure what you mean by "dt 92", but to answer your question...The room temperature will reach a certain temperature, even with the heating off. If that's 21°C then that's the temperature that will be shown on the thermostat, irrespective of your programming.