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Question About Honeywell Thermostat ultrastat T8400C 1404 (2)
I have an Ultrastat by honeywell thermostat. When...

I have an Ultrastat by honeywell thermostat. When I took off the cover the numbers listed inside is T8400C 1404 (2) 0416 1C As your looking at the cover, there is a small finger nail size round silver thing on the bottom. Is that the battery? What is the number of the battery for this thermostat?

Asked by Paula Herr on 09/29/2012 0  Answer

ManualsOnline posted an answer 12 years ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

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