This document is about the 8400 Series Thermostats user manual, which introduces the thermostat features, how to identify the thermostat model, thermostat controls and display, thermostat operation and programming, and thermostat warranty information.
This manual provides operating instructions and warranty information for the Aprilaire 8400 Series thermostats. It covers both non-programmable models (8444, 8446, 8448) and programmable models (8463, 8465, 8466), detailing features, controls, and display overviews for each type.
| Warranty Period | five (5) years |
|---|---|
| Power Source | AC or battery powered, or both |
| Fan Modes | ON, AUTO, CIRC |
Press and hold the Reset Button located under the battery cover for three seconds.
Press and hold the Reset Button and the Battery Door Message Center button together for three seconds.