How to Program a Honeywell Proseries Thermostat

The advanced menu lets you change thermostat settings such as the time and program schedule. To cycle through the advanced menu choices, hit the Menu button, then the Plus or Minus buttons. To switch on or off programming, make sure Program is shown on the screen, then push the Select button.

Here is a Steps for How to Program a Honeywell Proseries Thermostat

How to Program a Honeywell Proseries Thermostat

Base Settings

Power up the Unit

Once on, press the Select button to awaken the screen.

Setting the Year

Press the or + buttons to choose the year you want and press the Select button to finalize.  (I suggest choosing the current year)

Setting the Month

Once you’ve chosen the year, you’ll be prompted to enter the month. Again, use the + and buttons to traverse the months before clicking the Select button to finish.

Setting the Day

Just like with the month, you will be automatically asked to select the day, use the + and – buttons to navigate, and hit Select when the right one is on the screen.

Choosing Clock Format

Next, you will be asked to choose between a 12 and 24-hour clock.  Use the + or –, and Select buttons to make your decision.

Setting the Time

Use the + or –, and Select buttons to set the time as usual, except this time you may press and hold either Plus or Minus to cycle through the numbers faster. (While it may appear to be a great prank to set the time incorrectly and mislead people, it is critical to set the time correctly for the remainder of the programming to function properly.)

System operation settings:

Get to the Home Screen

This is an easy one, press the Home button and you’re there.  This will be your hub to navigate the rest of your options.

Select your System Mode

  1. Press the Mode button to cycle to the next Available System mode.
  2. Cycle through the modes until the required System mode is displayed and leave it to activate.

NOTE: Available System modes vary by model and system settings.

System modes:

  • ‒ Auto
  • ‒ Heat
  • ‒ Cool
  • ‒ Em Heat
  • ‒ Off

Program Schedule

You can program four time periods each day, with different settings for weekdays and weekends. We recommend the pre-sets (shown in the table below), since they can reduce your heating/cooling expenses.

How to Program a Honeywell Proseries Thermostat
  • Wake – Set to the time you wake up and the temperature you want during the morning, until you leave for the day.
  • Away – Set to the time you leave home and the temperature you want while you are away (usually an energy-saving level).
  • Home – Set to the time you return home and the temperature you want during the evening, until bedtime.
  • Sleep – Set to the time you go to bed and the temperature you want overnight (usually an energy-saving level).

NOTE: To temporarily or permanently override any of the above program schedules

To Edit/adjust program schedules

  1. Press Menu on your thermostat.
  2.  PROG is displayed. Press Select. Then ON is displayed. Press Select. If you do not want to use a schedule, press or display OFF. Press Select.
  3. Press or select a day or set of days to edit. Press Select.
  4. Press or select a schedule period to edit (Wake, Away, Home, and Sleep). Press Select.
  5. ON is displayed. Press Select to keep the schedule period on. Or press and then Select to turn off the schedule period.
  6. Time starts blinking. Press or adjust the schedule period start time. Press Select.
  7.  The temperature starts blinking. Press or to adjust the “Heat” set point temperature. Press Select. Press or adjust the “Cool” temperature set point. Press Select.
  8. Repeat steps 4 through 7 for the remaining schedule periods.
  9. Press Home when you’re finished to save and return to the home screen.
  10. The schedule can be adjusted and turned ON or OFF by returning to Menu and following the steps provided above.

To Set Fan Operation settings

  1. Press the Fan button to cycle to the next available Fan mode.
  2. Cycle through the modes until the required Fan mode is displayed and leave it to activate.

NOTE: Available Fan modes vary with system settings.

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Fan modes:

  • Auto: Fan runs only when the heating or cooling system is on.
  • On: Fan is always on.
  • Circ: Fan runs randomly about 33% of the time

Turning Off Certain Time Periods

If you do not want to have one or more of the Time Periods (Wake, Away, Home, Sleep) active navigate the menu and select the one you do not want.  From here use the + or –, buttons to switch from On to Off and then press Select

Finalize Changes

Once everything is set just how you want, press the Home button and return to the home screen.  There will be a screen that reads “Save” before the home screen appears.  Don’t worry, you can always return to your settings and make any adjustments you want.

Program schedule override (permanent)

  1. Press or to adjust the temperature.
  2. TEMPORARY HOLD is displayed and the setpoint temperature flashes. While it’s flashing, press the Hold (Mode) button to change to Permanent Hold.
  3. To cancel the Permanent Hold, press or and then press Cancel.


How to Reset a Honeywell Programmable Thermostat

  1. Set the thermostat switch to “Off.”
  2. Insert a coin into the slot on the battery door to push it open.
  3. Remove the batteries.
  4. Insert the batteries backward, so that the negative pole lines up with the positive terminal.
  5. Remove the batteries and put them back in the correct way, then close the battery door.

Should your thermostat be on auto or on?

Auto” means that the fan automatically works ONLY when the air is being heated or cooled. So once your home reaches the temperature set on the thermostatthe fan stops. “On” means the fan is on 24/7, even when the air isn’t being heated or cooled.

Can I Perform A Factory Reset On CM921 And CM927 Programmable Thermostat?

  1. Press the button to get to the 19:FS (category 1) parameter.
  2. Press the buttons to change factory settings.
  3. Press the green button to confirm the change.
  4. Set back to MAN or AUTO in order to exit the Installer Menu.

What Does The Hold Mean On A Thermostat?

If your schedule changes, the “hold” option allows you to override the pre-set temperature and thermostat setting. For example, if you have a day off in the middle of the week and are at home, you may press the “hold” button to lock in the current temperature while you are there.

What model is my Honeywell thermostat?

Flip the thermostat itself over and look for the model number, which should be printed somewhere on the back of the case. Thermostat model numbers all begin with T,” “TH,” “RTH” “C,” or “CT.” Oftentimes, there will be a “Y” in front of the model number.

How to Troubleshoot Honeywell Pro Series Thermostat Troubleshooting

Further information about Honeywell issues and how to fix them are in detail in this topic… Honeywell Thermostat Pro Series


More Info: Honeywell Support

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