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What is the brand and model of your thermostat?
I can't help without a model number
It's sometimes inside the cover.
That's a serial number.
Is this your thermostat?
If so then changing the temp scale is under advanced features. Instructions start on page 16
Here's the brochure. Which one is yours
Well the Deluxe model that I posted earlier is the only current model with no buttons. If that's not it I can't help you without a model number.
I posted the manual earlier here it is again:
changing the temp scale is under advanced features. Instructions start on page 16