How to Program a Honeywell Digital Thermostat

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If you have a programmable digital thermostat, there is a extremely high possibility it is a Honeywell model. The leading maker of thermostats, Honeywell provides dozens of several models, ranging from very easy styles that allow you set a single automated program that is the same everyday, to elaborate touch-screen models that make it possible to set a several group of automatic temperature adjustments for each day of the week.

How to Program a Honeywell Digital Thermostat
How to Program a Honeywell Digital Thermostat

The benefit of programmable thermostats is now well-known to nearly everyone. By automating the process of turning down the temperature at night or when you are leave from the house, you can relish energy savings that range from 10% to 30%.


Knowing if Your Thermostat is Programmable

When a great many (maybe most) thermostats made by Honeywell are now digital programmable models, there are still easy operational thermostats manufactured and used-thermostats that simply allow you to elevate, lower, and set temperatures without any automation. Determining if yours is a programmable model is not always simple.

For many Honeywell thermostats, the presence of a push-button “PROG” or “Set” key is the giveaway that the thermostat is programmable. Those that aren’t programmable have nothing to set, and so they are missing this button. The photos here show the difference between a typical non-programmable thermostat and one that can be programmed.

One of the latest models, you may find no buttons at all, but alternatively, there is a touch-screen feature in which you’ll read the “set” command in the screen itself.

Here are any popular Honeywell thermostat models and their role or functions. It is by no means an exhaustive list, but it does demonstrate the variety available. Likely, your thermostat is closely related to one of these:


Non-Programmable Models

  • Pro 5000 series (TH5110D, TH5320U, TH5220D): non-programmable thermostats with new digital screens.
  • RTH5100B: A premium non-programmable thermostat with a new digital screen.

Programmable Models

  • RTH221B: A primary 1-week programmable offering one program.
  • RTHL2310B: A basic 5-2 thermostat offering two programs.
  • RTH6450D: A 5-1-1 thermostat offering three programs.
  • RTH2510B1018: A seven-day programmable thermostat with a new digital screen.
  • RTH7560E: A seven-day programmable model with new touch-screen controls.
  • RTH8580WF: A seven-day programmable model with WI-FI connectivity technology.

How to Set a Honeywell Programmable Thermostat

Because there are many models in thermostat styles, it’s difficult to describe the programming process for every one of them. However, they will all follow much the same process, so it should be an easy matter to interpret the following instructions, even if your thermostat doesn’t exactly match.

Our guidance happens to be based on the Honeywell RTH6450D1009 5-1-1 thermostat, shown above, but virtually all Honeywell thermostat is programmed with a process that is similar, if not identical.


Step 1: Set the Time

Push the SET button until the time of day display begins to flash on the screen. Then use the arrow buttons to adjust the time up or down till the correct time-of-day is displayed. Press the DONE button to lock this time into the thermostat.

NOTE: On any thermostats, pressing the SET key a second time is what locks the time into the thermostat.

Step 2: Set the First Program

  1. Press the SET key, then press the key labeled “SET SCHEDULE”. (On some thermostats, you press the SET key some times to toggle through the more functions on the thermostat.)
  2. Press the UP and DOWN arrow keys until the display flashes to the MON-FRIDAY WAKE display, then press NEXT.
  3. Use the UP and DOWN arrow keys to set the time you frequently wake up during the Mon-Friday work week. When the proper time is set, press NEXT.
  4. Now use the UP and DOWN arrow keys to setup the temperature you desire for that weekday wake-up time. When the right temperature is displayed, press the NEXT button to lock in that temperature and move on to the next time interval.
  5. Use the UP and DOWN arrow keys and the NEXT button to lock in times, then temperatures, for the next step of the program: Leave, Return, and Sleep. This four-temperature program is standard on most perfect programmable thermostats.

Step 3: Set the Next Program

Upon locking in the last temperature period for Mon-Friday, the next press of the NEXT key will activate the following program available on your thermostat. For our thermostat, this is the Saturday program. Program this in the same fashion (see step 2), and repeat until all programs are set. This may be only one new program for a 5-2 thermostat or as many as six more for a seven-day thermostat.

Step 4: Completing the Program and Making Adjustments

A easy press of the DONE button locks in the program and closes the setup menu.

If you have made an error in the initial programming, or if your schedule changes and you need to adjust the program, the process is simple:

Press the SET SCHEDULE button, then toggle through the menu options by using the NEXT button and UP/DOWN arrow keys to toggle through the functions and make new settings. For the case, let’s imagine that you want to change both the time for waking and the temperature for that time of day. The keypress sequence would look like this:

  2. UP or DOWN arrow keys till WAKE period begin to flash on the screen
  3. UP or DOWN arrow. keys until new wake time you desire are displayed
  4. NEXT
  5. UP or DOWN a.rrow keys until the desired temperature is displayed
  6. DONE (on some, you may need to toggle through the other periods and programs before the DONE key displays)

Step 5: Overriding the Program

What happens if you have stayed home for work someday, for the case, and don’t want the thermostat program to send the temperature down to 60°? Just only press the arrow keys until the desired temperature is displayed on the screen. Your thermostat will present the word “TEMPORARY” on the screen, and the thermostat will then hold the temperature at that level. At the point where you want to resume the program, just only hit the RUN SCHEDULE button.

Another way to override the program is to press the HOLD button, which will tell the thermostat to hold the temperature at the current level until you deactivate it.

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