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Are you in heat mode or AUTO? DO you want a set temp all the time or are you trying to program it?
Press the up or down arrows to set the temp where you want then press HOLD and the thermostat will maintain that temp. If you just adjust the temp up or down this will only provide a temporary hold for 4 hours
Is there a padlock icon on the display?
Then the thermostat is malfunctioning and will probably have to be replaced. But there is a rest function. Try that first. I'll be back in a few with instructions
To reset remove the thermostat from the wall and remove the batteries for 2 minutes then put them back in and put the thermostat back on the back plate. If that doesn't work then you'll need a new one
Then you need a new thermostat.
I can't fix your thermostat if it's broken no one can. If you want a refund contact customer service