90 Series Thermostat?

How do I find my 90 thermostat type number?

Remove the front cover from the wall plate.
TYPE or MODEL Number is located on inside of front cover.

Listed below are links to information for 90 Series Digital thermostats. 

• Installation/operating instructions -- 90 Series Digital thermostats
• Frequently Asked Questions (FAQs) -- 90 Series thermostat operation.

Here are quick programming guides for 90 Series digital programmable thermostats:

• 1F90-371 -- 90 Series, 5 + 2/5 + 1 + 1 day models.
• 1F97-371 -- 90 Series, 7-day model.