I just changed the batteries on my Honeywell Chronotherm IV Plus, programmable thermostat and the temperature shown for the room is extremely high (104 degrees now) when the room is about 67 degrees. How do I fix?

Here's a link to download a manual for that thermostat

Honeywell Chronotherm IV Plus Thermostat

Unfortunately, I don't see anything in it (on a cursory examination) that says how to fix this. The temperature sensor inside it may be damaged. Maybe you see something that I missed.

Its not a Farenheit/Centegrade switching problem, and although they call it an advanced computer, can't find a reset.
Here's their Number:
1-800-468-1502