To manually adjust your Honeywell thermostat, press the Up or Down arrows to reach your desired temperature. To override the schedule, press the Hold button once for a temporary hold or twice for a permanent hold, and press Run to return to the automatic schedule.
To find out which Honeywell thermostat you have, gently pull the faceplate straight off the wall. Flip it over or look inside the battery compartment to find the model number (usually starting with TH, T, RTH, RCHT, or CT).
Changing the schedule on a Honeywell thermostat depends on whether you have a traditional programmable model or a smart, app-connected device. Below are the steps for the two most common methods:
Program schedule override (Permanent)
Once at the desired setpoint temperature, press and release the HOLD button to cycle through the settings until HOLD PERMANENTLY is selected. Press the SAVE button or wait for the display to time out and return to the Home screen.
To keep your thermostat at a constant temperature, disable any preset daily schedules and activate the Hold or Permanent Hold feature. This overrides automatic adjustments, locking your heating or cooling system at a single, steady temperature until you manually change it.
Hold the reset button (if present): Some non-programmable Honeywell Thermostats have a dedicated reset button, usually located near the display or behind a cover panel. If your model has one, hold it down for about 5-10 seconds while the power is off.
To override your Honeywell thermostat schedule, you can use either a Temporary Hold (changes the temperature until the next scheduled time period) or a Permanent Hold (maintains a specific temperature indefinitely).
For most programmable Honeywell thermostats, you can perform a factory reset by simultaneously pressing and holding the Fan button and the Up arrow for about 5 to 7 seconds. This opens the ISU (Installer Setup) menu, allowing you to select and restore default settings.
It's generally recommended to set the thermostat to a temperature that you find comfortable; however, the World Health Organization recommends keeping room temperatures below 89.6 degrees Fahrenheit during the day and 75.2 degrees Fahrenheit at night for health and comfort.
Turn off the power to your thermostat before checking the wiring as high voltages can be dangerous and even fatal. You can also look into the gang box of your existing thermostat. If you have black and white wires you likely have 120V. If you have black and red wires you likely have 240V.
Older Honeywell thermostats generally fall into three categories: mechanical/analog (e.g., The Round), digital non-programmable (e.g., RTH111B), and digital programmable (e.g., RTH221B). Troubleshooting or operating these units typically requires identifying the specific model and its basic settings.
For most thermostats, the Model Number is located on the back of the detachable face plate. You can also find this on your product packaging, as well as included literature.
Setting a thermostat temperature requires just a few simple steps: select your system mode (Heat or Cool), and press the Up/Down arrows or turn the dial until your target temperature displays.
After removing the thermostat, flip it over and look for the model number, which is printed on the back of the case, starting with the group of letters mentioned above. If the thermostat is battery operated and the batteries are accessed from the front of the thermostat, please check the area around the batteries.
To quickly resolve a Honeywell thermostat issue, replace the old batteries, verify the HVAC power switch and circuit breaker, and perform a system reset by removing the unit from the wall.
The way to reset a thermostat depends on its type. For programmable or smart thermostats, you usually access the factory reset or reboot options directly through the device's settings menu or by power cycling the HVAC system at the breaker for 30 seconds.
To program your Honeywell thermostat, first ensure the current day and time are set. Then, access the program menu to set up to four time periods per day (Wake, Away, Home, and Sleep).
Your thermostat has two basic settings that you can utilize when you're looking to alter the temperature inside of your home. The heat setting will turn on your furnace to warm up your home. The cool setting will turn on your air conditioning system to cool down your home.
Touch the screen. You will be asked for a passcode to unlock and enter the screen. You will need to add 1234 to your date code.
For most programmable Honeywell thermostats, you can perform a factory reset by simultaneously pressing and holding the Fan button and the Up arrow for about 5 to 7 seconds. This opens the ISU (Installer Setup) menu, allowing you to select and restore default settings.
Why you might need to reset/reboot your HVAC thermostat
Resetting a thermostat clears its internal settings, which resolves software glitches, restores lost Wi-Fi connections, and fixes inaccurate temperature readings. It wipes out minor bugs caused by power surges and re-establishes normal communication between the thermostat and your HVAC system.