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Has this always happened with this thermostat or is this something more recent?
Sorry, thought you were offline. This can be caused by a defective thermostat in most cases. Another thing that can influence this is if the thermostat is too close to a supply register.
In this manual, on page 4, make sure you have your fast or slow heating cycle rate set up for forced air and not hydronic.
Also, if you note in this manual, in the troubleshooting tips, if the thermostat setting and thermometer disagree, you can move it plus or minus 4 degrees by going to the configuration menu.
You could try that before actually replacing the thermostat.
Let me know if you have trouble accessing the link (above) or need any help with this. Thanks!
Did you have additional questions on this?