How to Program Honeywell T8112D Thermostat

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Things You'll Need

  • Installed Honeywell T8112D thermostat

  • 2 AA Batteries


To temporarily override the pre-programmed temperature, press the temperature control keys up or down to go warmer or cooler. To go back to the temperature setting hit the "Run program" button.

To override the pre-programmed temperature for several hours or more, press in on the "Hold" key and then change the temperature with the up or down arrows.


Change the batteries in your thermostat at least once a year, whether the low battery indicator light comes on or not. If the batteries get too low the thermostat will not function properly.

Honeywell T8112D

Honeywell is a major producer of quality home thermostats. The Honeywell T8112D thermostat offers a homeowner reliable temperature control at an affordable price. The pre-programmable thermostat can be wired to a heating and cooling system, and the ability to pre-program it for home, away, sleep and awake times makes it an energy and money saver as well. Programming a Honeywell T8112D thermostat can be done in a minutes.

Step 1

Install the new 2 AA batteries before beginning the programming steps.

Step 2

Program the heat by quickly pressing and letting go of the schedule key. On the screen will appear the words "Wake" and "Set."

Step 3

Set the wake temperature by first setting the time for the temperature change. Press the up or down time arrow keys to select the time, then select the up or down temperature keys to select the temperature the house should be set to at that time.

Step 4

Press "SET", and then repeat the process above for "Leave". Repeat again to set "Return" and "Sleep" temperature and time.

Step 5

Quickly press the "Schedule" key again until you see "Sat", "Sun" and "Wake" and "Set" on the screen.

Step 6

Repeat Step 3 to set the "Wake" and "Sleep" time and temperature.

Step 7

Set the cooling program on the thermostat by turning the off switch to "Cool", and repeat the above steps.


Traci Joy

A certified nutritionist who majored in health, fitness and nutrition, Traci Vandermark has been writing articles in her specialty fields since 1998. Her articles have appeared both online and in print for publications such as Simple Abundance, "Catskill Country Magazine," "Birds and Blooms," "Cappers" and "Country Discoveries."