Honeywell Thermostat RTH2300 Programming Instructions

How to Program Honeywell RTH2300 Thermostat
How to Program Honeywell RTH2300 Thermostat

If you are struggling with programming your thermostat, using the instructions that came with the thermostat, here are detailed step-by-step Honeywell Thermostat RTH2300 programming instructions…

Hardware:

Parts Needed:

Honeywell Thermostat RTH2300 Programming Instructions

Tip: You do not need to have the thermostat on the wall to set it up.  You can have it popped off the wall when doing these steps.  If your furnace is running it may shut off though and I would shut it off before pulling the thermostat off the mounting plate.  But if you are setting it for the first time it is a lot easier to follow these steps form the comfort of a chair.

Step 1: If you are programming it for the first time-put in two AAA batteries.

Insert the batteries with their positive end on the right side as seen below:

Honeywell RTH2300 Thermostat with two AAA batteries installed
Install 2 AAA batteries with the positives on the right

If not programming it for the first time you can just press the “Set” button.  The title will say “–Set Time        –” on the top and the time will flash:

Honeywell RTH2300 Thermostat Set Time Mode
Set Time Mode

Step 2: Set the time and day.

Step 2a: Press the up/down arrow-shaped buttons to adjust the time.

You set it by changing the minutes.  If you press and hold it will change very quickly.  Make sure you pay attention to AM/PM.  Press the up/down buttons to change the time and when you are at the correct time, press the “Set” button again.

Honeywell RTH2300 Thermostat Up-Down Arrow Buttons
Press the up/down buttons to change the time

Step 2b: Change to day set mode.

Press the “Set” button again to transition from time set to day set.  The title bar will change to “– Set          Day –” and the day abbreviation will flash:

Honeywell RTH2300 Thermostat Set Day Mode
Set Day Mode

Step 2c: Press the up/down arrow-shaped buttons to adjust the day.

Once you are done setting the day press the “Run” button.  The display will return to normal.

Step 3: Pre-determine your program schedule

It is much easier if you know how you want to program it in advance.  I have created a table for you to fill out which will make programming this thermostat a breeze (click on the image and then print):

Honeywell RTH2300 Thermostat Programming Template
Honeywell RTH2300 Thermostat Programming Template

Here’s an example schedule.  Note that there really is no “leave” schedule because my wife stays home with our kids and this would work also for someone with a home business where they don’t leave during the day:

Honeywell RTH2300 Thermostat Programming Example
Honeywell RTH2300 Thermostat Programming Example

Step 4: Enter programming mode.

Step 4a: Put the thermostat in the mode you want to program–Heat or Cool.

Important: You need to set it to Head or Cool because each one has its own program!  Don’t miss this or you will be wasting your time as you go forward.

Heat/Off/Cool Mode Switch
Heat/Off/Cool Mode Switch

Step 4b: Enter the program schedule mode.

If you are on a normal screen with nothing flashing, press the “Set” button 3 times.  If something is flashing press “Run” first and then press “Set” 3 times.

Note: If you let the thermostat set for a little while it will return to normal run mode.  This is why Step 3b is so important–it will save you a lot of time.  If you haven’t determined your schedule go back to Step 3b and get that squared away.

After you press “Set” three times you will see this the time flashing, Mo-Fr, Wake, and “–Set Schedule–” along the bottom:

Weekday Wake Mode
Weekday Wake Mode

The number you are currently editing will flash at each stage and you can see the day-range you are editing by the days that show up and the Wake/Leave/Return/Sleep time slot will display as well if you loose track of which time/day you are editing at the moment.

Step 5: Program the Weekday schedule.

Below the time you will see: “Mo Tu We Th Fr” displayed below the time.

Step 5a: Press the up/down buttons to set the Weekday “Wake” time.

The time will change in increments of 15 minutes in this mode.  Press the “Set” button to move on.

Step 5b: Press the up/down buttons to set the Weekday “Wake” temperature.

Adjust the temperature to the weekday wake temperature.  Press “Set” to move on.

Press 5c: Press the up/down buttons to set the Weekday “Leave” time.

The time will change in increments of 15 minutes in this mode.  Press “set” to move on.

Step 5d: Press the up/down buttons to change the Weekday “Leave” temperature.

Adjust the temperature to the weekday leave temperature.  Press “Set” to move on.

Press 5e: Press the up/down buttons to set the Weekday “Return” time.

The time will change in increments of 15 minutes in this mode.  Press “set” to move on.

Step 5f: Press the up/down buttons to change the Weekday “Return” temperature.

Adjust the temperature to the weekday leave temperature.  Press “Set” to move on.

Press 5g: Press the up/down buttons to set the Weekday “Sleep” time.

The time will change in increments of 15 minutes in this mode.  Press “set” to move on.

Step 5h: Press the up/down buttons to change the Weekday “Sleep” temperature.

Adjust the temperature to the weekday leave temperature.  Press “Set” to move on.

Step 6: Program the Weekend Schedule:

The program will automatically go to the weekend after you press “Set” in Step 5h above–you must go through the weekday schedule to get to the weekend schedule.

Setting the Weekend Program
Setting the Weekend Program

You will see “Sa Su” displayed below the time in the weekend schedule mode.

Step 6a: Press the up/down buttons to set the Weekend “Wake” time.

The time will change in increments of 15 minutes in this mode.  Press the “Set” button to move on.

Step 6b: Press the up/down buttons to set the Weekend “Wake” temperature.

Adjust the temperature to the weekend wake temperature.  Press “Set” to move on.

Press 6c: Press the up/down buttons to set the Weekend “Leave” time.

The time will change in increments of 15 minutes in this mode.  Press “set” to move on.

Step 6d: Press the up/down buttons to change the Weekend “Leave” temperature.

Adjust the temperature to the weekend leave temperature.  Press “Set” to move on.

Press 6e: Press the up/down buttons to set the Weekend “Return” time.

The time will change in increments of 15 minutes in this mode.  Press “set” to move on.

Step 6f: Press the up/down buttons to change the Weekend “Return” temperature.

Adjust the temperature to the weekend leave temperature.  Press “Set” to move on.

Press 6g: Press the up/down buttons to set the Weekend “Sleep” time.

The time will change in increments of 15 minutes in this mode.  Press “set” to move on.

Step 6h: Press the up/down buttons to change the Weekend “Sleep” temperature.

Adjust the temperature to the weekend leave temperature.  Press “Set” to move on.

Step 7: Press “Run” to exit the programming mode.

Now you are done!  You can repeat these steps, without changing any of the times/temps by simply pressing “Set” each time instead of changing the number.

Thermostat Programming Done!
Programming Done!

Did this article help you program your thermostat?  Do you have a tip to add?  Questions? Please leave a comment!

Thermostat instruction manuals always leave me wishing for more.  Hopefully this tutorial made it easier.  If it was helpful for you please encourage the other readers by sharing about your success.  Also, if you have tip, correction, or question, please share that in the comments as well–I like to keep improving these articles and enjoy interacting with readers.

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