How to Reset Honeywell Thermostat Old Model: A Step-by-Step Guide

How to Reset Honeywell Thermostat Old Model?

To reset an old model of Honeywell thermostat, there are a few steps you can follow.

For battery-powered thermostats, start by powering off the thermostat and removing the batteries.

Put the batteries back in the wrong way for 10 seconds, and then put them back in the correct way.

You can then reprogram the thermostat.

For hardwired thermostats, refer to a resource for specific instructions.

If you need to replace the batteries, remove the faceplate, take out the old batteries, install new ones, and reattach the faceplate.

Make sure your programmed settings are still stored correctly.

If the thermostat doesn’t turn back on after replacing the batteries, contact a professional service for assistance.

For specific instructions on how to reset other Honeywell thermostat models, consult the user manual or official resources provided by Honeywell.

Key Points:

  • Power off the thermostat and remove the batteries for battery-powered thermostats
  • Put the batteries back in the wrong way for 10 seconds and then put them back in the correct way
  • Reprogram the thermostat
  • Refer to a resource for specific instructions for hardwired thermostats
  • Replace batteries by removing the faceplate, taking out old batteries, installing new ones, and reattaching the faceplate
  • Check that programmed settings are still stored correctly

Did You Know?

1. In the 1920s, the first “modern” thermostat was developed by Warren S. Johnson. This device, known as the Johnson Electric Room Regulator, was the precursor to today’s Honeywell thermostats.

2. The Honeywell T87 round thermostat, also known as “The Round”, was introduced in 1953 and became an iconic design that is still produced today. The classic round shape was initially chosen to resemble a clock, making it more relatable and familiar to homeowners.

3. Honeywell was the first company to introduce programmable thermostats to the market in 1987. This innovation allowed users to set different temperature schedules throughout the day, resulting in increased energy savings and comfort.

4. Honeywell thermostats have been used in several significant NASA missions, including the famous Apollo manned moon landings. The precise temperature control provided by Honeywell thermostats was crucial for maintaining the correct operating conditions in space capsules and lunar modules.

5. Did you know that Honeywell thermostats played a role in the 2014 Winter Olympics in Sochi? Honeywell helped ensure a comfortable and energy-efficient environment in the Olympic venues, such as the Olympic Stadium and Iceberg Skating Palace, through their advanced thermostat technology.

1. Reasons For Resetting A Honeywell Thermostat

Resetting a Honeywell thermostat for old models may become necessary due to various reasons. The first reason is problems with programming. Sometimes, the thermostat may not be functioning correctly or may not be accurately setting temperatures as desired. In such cases, resetting the thermostat can help resolve these issues.

Another common reason for resetting an old Honeywell thermostat is trouble with the connection to the furnace or AC unit. If the thermostat is not properly communicating with the heating or cooling system, it may result in inconsistent functioning. Resetting the thermostat can establish a fresh connection, eliminating any communication issues.

In addition, if you notice that the thermostat is providing inconsistent or inaccurate temperature readings, a reset may be necessary. This can often occur when the thermostat’s internal sensor is not functioning correctly or has become calibrated incorrectly. Resetting the thermostat can recalibrate the sensor and ensure more accurate temperature readings.

2. Resetting Battery-Powered Thermostats

If you have a battery-powered Honeywell thermostat, you can easily perform a reset by following these steps:

  1. Power off the thermostat by switching it off.
  2. Remove the batteries from the thermostat.
  3. Leave the batteries out for about 10 seconds before reinserting them. Make sure to put them back in the correct way.
  4. After resetting the thermostat, you’ll need to reprogram it according to your desired settings.
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3. Resetting Hardwired Thermostats

For hardwired thermostats that do not use batteries, the process of resetting may vary. In such cases, it is recommended to refer to the instruction manual or consult official resources provided by Honeywell for specific guidance on how to reset your particular model. These resources can provide step-by-step instructions to help you successfully reset your hardwired thermostat.

4. Replacing Batteries In A Honeywell Thermostat

To replace the batteries in a Honeywell thermostat, follow these steps:

  1. Begin by removing the faceplate of the thermostat.
  2. Locate the old batteries and remove them from the battery compartment.
  3. Install the new batteries into the compartment, paying careful attention to their proper orientation.
  4. Finally, reattach the faceplate to the thermostat.

It is essential to double-check that all your programmed settings have been retained correctly after replacing the batteries.

“If the thermostat does not turn on even after replacing the batteries, it is advisable to seek professional assistance.”

Expert technicians, like those at One Hour, can provide effective troubleshooting and resolution for any thermostat issues you may encounter.

  • Seeking professional help for unresolved thermostat problems is recommended.
  • One Hour’s expert technicians can offer effective troubleshooting and resolution.

5. Locking And Unlocking The Honeywell Thermostat

Honeywell thermostats have a lock feature that allows users to restrict access to temperature adjustments and program changes. To lock or unlock the thermostat, follow these steps:

  • Press the Center or Menu button on your thermostat.
  • Enter the passcode “1234”. This passcode will unlock the thermostat, granting access to adjustments and changes.

If you are setting up the thermostat for the first time, it is recommended to set a unique passcode and store it in a secure location.

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In case you forget the passcode for your Honeywell thermostat, there is a workaround. You can reset the passcode by following these steps:

  • Remove the thermostat from its base plate.
  • Locate the four-digit date code on the back.
  • Add “1234” to the date code to generate a new passcode.
  • Enter the new passcode through the Menu option on the thermostat to reset the passcode.

6. Resetting Instructions For Specific Models

Different models of Honeywell thermostats may have specific instructions for resetting. Here are the reset instructions for various Honeywell thermostat models:

  • T9 (RCHT9510WF, RCHT9610WF):
  • To perform a factory reset, press the Menu icon, select “Advanced Setup,” then choose “Reset” and finally “Factory Reset.”
  • For a WiFi reset, select the Menu icon, go to “WiFi,” then “Change Network” and enter the new WiFi network and password.
  • For a schedule reset, follow the same steps as the factory reset but select “Schedule Reset.”
  • Lastly, for a HomeKit reset, choose the Menu icon, select “Advanced Setup,” then “Reset,” and finally “HomeKit Reset.”

  • T10 (THX321WF):

  • To perform a factory reset, press the Menu icon, go to “Thermostat Information,” and record the “Date Code.”
  • Then select “Installer Options,” enter the Date Code as the password, and finally select “Reset” and “Factory Reset.”
  • The WiFi reset follows the same steps as the factory reset, but you choose “WiFi” instead.
  • The schedule reset is the same as the factory reset, but you select “Schedule Reset.”
  • For a HomeKit reset, follow the same steps as the factory reset, but select “HomeKit” instead.

  • T5+/T5/T6 (RCHT8610WF, RCHT8612WF, TH6320WF2, TH6220WF2):

  • To perform a factory reset, press and hold the Menu button, navigate to “Reset,” select it, navigate to “Factory Reset,” and select it.
  • The WiFi reset is the same as the factory reset, but you select “WiFi” instead.
  • The schedule reset follows the same steps, but you choose “Schedule.”
  • For a HomeKit reset, follow the same steps as the factory reset, but select “HomeKit Reset.”

  • Smart/Lyric Round (TH8732WFH):

  • To perform a factory reset, press and hold the Cloud Icon, then press “i” until further instructions appear.

  • Smart WiFi 9000 (RTH9580WF, RTH9585WF, TH9320WF):

  • For a WiFi reset, press and hold the Cloud Icon, then select WiFi.
  • For a factory reset, press Menu, select Preferences, and then choose Restore Factory Defaults.

  • FocusPro 6000 (TH6320WF1, RTH6580WF):

  • To perform a factory reset, press and hold the Fan button, change the left number to 90 and the right number to 1, then press Done.
  • For a WiFi reset, press and hold Fan, change the left number to 39 and the right number to 0, then press Done.

  • VisionPRO 8000 (TH8320WF, RTH8580WF):

  • To perform a factory reset, press System, hold the blank box in the center, change the left number to 0710 and the right number to 1, then press Done.
  • For a WiFi reset, press System, hold the blank box in the center, change the left number to 0900 and the right number to 0, then press Done.

  • VisionPRO TH8321WF:

  • To perform a factory reset, go to Menu, scroll to Dealer Information, write down the date code, go to Installer Options, enter the date code, select Reset to Defaults.
  • For a WiFi reset, press Menu and select WiFi.
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Please note that these instructions are specific to the models mentioned. It is advisable to consult your Honeywell thermostat manual or official resources for instructions tailored to your particular model.


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Frequently Asked Questions

How do I reset an older Honeywell thermostat?

To reset an older Honeywell thermostat, start by powering it off and removing the batteries. Then, reverse the battery placement by putting the negative end into the positive slot and the positive end into the negative slot. After waiting for about ten seconds, put the batteries back in the correct way. This process will reset the thermostat to its factory settings, allowing you to start afresh with your desired configurations.

Can you reset an old thermostat?

Yes, it is possible to reset an old thermostat using a few simple steps. Firstly, if your thermostat has a recessed reset button, locate it and press it down using a paperclip for approximately 5 seconds. Release the button and wait for the thermostat to reboot. However, if your thermostat is battery-operated and the reset mode didn’t prove effective, another option is to remove the batteries for about 5 seconds and then reinsert them. This can often resolve any issues and reset the thermostat to its default settings.

How do you reset a thermostat?

To reset a thermostat, begin by switching it to the off position. Once this is done, find the corresponding breaker that controls your HVAC system and turn it off. After waiting for about 30 seconds, switch the breaker back on. Finally, turn your thermostat on again and ensure that it has successfully reset.

Is there a reset button on a thermostat?

Yes, most thermostats have a reset button, but the process of resetting the thermostat can vary depending on the model. One common method is to use a pin or paper clip to push a recessed reset button. Alternatively, you can reset the thermostat by installing the battery backward for a few seconds, or by shutting off the breaker to the thermostat for about 30 seconds. It is important to consult your specific thermostat’s manual or contact the manufacturer for the correct reset procedure.

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