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Heating and Cooling
How to Unlock a Honeywell Thermostat Download ArticleExplore this Article IN THIS ARTICLE 1 Press the center button. 2 Use the + and - buttons to enter the 1234 pin. 3 Hit “Select.” 4 Press “back” to try again. 5 Lock the thermostat in the main menu. + Show 2 more... - Show less... Other Sections Tips and Warnings Related Articles References Co-authored by Hannah Madden
Last Updated: July 29, 2022 Fact Checked
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This article was co-authored by wikiHow staff writer, Hannah Madden. Hannah Madden is a writer, editor, and artist currently living in Portland, Oregon. In 2018, she graduated from Portland State University with a B.S. in Environmental Studies. Hannah enjoys writing articles about conservation, sustainability, and eco-friendly products. When she isn’t writing, you can find Hannah working on hand embroidery projects and listening to music. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 150,100 times. Learn more...
Trying to adjust your Honeywell thermostat, but finding that you’re locked out? You’re not alone—many people are puzzled by the locking function on this important tool in their home. Fortunately, unlocking the thermostat is easy, and can be done in just a couple of steps. Keep reading to learn how to unlock your Honeywell thermostat and adjust the lock settings in under a minute.
Steps
1
Press the center button.
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Hit “Unlock” to start unlocking the thermostat. The center button will have a small “Unlock” label on the screen, right underneath the temperature reading. Hit that button to go to the next screen.[1]XResearch source
On the 8000 series, hold down the “System” and “Auto” options, then hold the blank lower center button.
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Use the + and - buttons to enter the 1234 pin.
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The plus and minus buttons adjust the pin on the screen. Once you hit “unlock,” you’ll be taken to a new, blank screen that’s waiting for you to input your pin. Use the + button to add a number, and use the - button to subtract a number.[2]XResearch source
Once you’ve entered a number, hit “Select” to move to the next digit.
Most Honeywell thermostats come with a default passcode of 1234. Some models let you change the pin in the security settings, while others don’t.
If you have an 8000 series, the passcode is 0670.
3
Hit “Select.”
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Hitting “Select” tells the thermostat that you’ve entered your pin. Once you’ve got your passcode entered in, simply hit “Select” one more time. Now your thermostat is unlocked, and you can change the temperature or adjust the settings to your liking.[3]XResearch source
On the 8000 series, hit “Done.”
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Press “back” to try again.
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If you entered the wrong passcode, you can enter it again. Entering the wrong passcode will bring you to a new screen that just says “---”. On that screen, hit the “back” button to go back and re-enter the passcode.[4]XResearch source
5
Lock the thermostat in the main menu.
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You can lock your thermostat or partially lock it again. From the thermostat’s home screen, press “Menu,” then hit the + or - buttons until the screen says “LOCK.” Hit “Select,” then choose which lock setting you’d like your thermostat to be on. Settings include:[5]XResearch source
OFF: The thermostat is unlocked, and full access is allowed.
PART: The thermostat is partially locked, and only the temperature can be changed.
ON: The thermostat is fully locked, and will have to be unlocked for any changes.
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Tips
If you forgot your code, take the thermostat off the wall and look for the number on the back of the device. Find that number, then add 1234 to it. That number will bypass your passcode and let you into the thermostat. Thanks Helpful 69 Not Helpful 40
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Co-authored by: Hannah Madden wikiHow Staff Writer This article was co-authored by wikiHow staff writer, Hannah Madden. Hannah Madden is a writer, editor, and artist currently living in Portland, Oregon. In 2018, she graduated from Portland State University with a B.S. in Environmental Studies. Hannah enjoys writing articles about conservation, sustainability, and eco-friendly products. When she isn’t writing, you can find Hannah working on hand embroidery projects and listening to music. This article has been viewed 150,100 times. 27 votes - 70% Co-authors: 2Updated: July 29, 2022 Views: 150,100 Categories: Heating and Cooling In other languagesJapanese
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Reader Success Stories
Robert W.
Jan 21, 2024
"Just a simple story of locking the thermostat, didn't know the code. wikiHow instructions solved my problem."
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Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Co-authored by: Hannah Madden wikiHow Staff Writer 27 votes - 70% Click a star to vote Co-authors: 2Updated: July 29, 2022 Views: 150,100
Robert W.
Jan 21, 2024
"Just a simple story of locking the thermostat, didn't know the code. wikiHow instructions solved my problem."
Anonymous
May 4, 2023
"Thanks. My landlord thinks he's slick locking down the thermostat."
Anonymous
May 9, 2025
"A method to unlock the thermostat that actually works." Share yours! More success stories Hide success stories
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Download Article Explore this Article IN THIS ARTICLE 1 Press the center button. 2 Use the + and - buttons to enter the 1234 pin. 3 Hit “Select.” 4 Press “back” to try again. 5 Lock the thermostat in the main menu. + Show 2 more... - Show less... Other Sections Tips and Warnings Related Articles References Co-authored by Hannah Madden 
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Co-authored by: Hannah Madden wikiHow Staff Writer This article was co-authored by wikiHow staff writer, Hannah Madden. Hannah Madden is a writer, editor, and artist currently living in Portland, Oregon. In 2018, she graduated from Portland State University with a B.S. in Environmental Studies. Hannah enjoys writing articles about conservation, sustainability, and eco-friendly products. When she isn’t writing, you can find Hannah working on hand embroidery projects and listening to music. This article has been viewed 150,100 times. 27 votes - 70% Co-authors: 2 Updated: July 29, 2022 Views: 150,100 Categories: Heating and Cooling In other languagesJapanese 
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Hit “Unlock” to start unlocking the thermostat. The center button will have a small “Unlock” label on the screen, right underneath the temperature reading. Hit that button to go to the next screen.[1] 
The plus and minus buttons adjust the pin on the screen. Once you hit “unlock,” you’ll be taken to a new, blank screen that’s waiting for you to input your pin. Use the + button to add a number, and use the - button to subtract a number.[2] 
Hitting “Select” tells the thermostat that you’ve entered your pin. Once you’ve got your passcode entered in, simply hit “Select” one more time. Now your thermostat is unlocked, and you can change the temperature or adjust the settings to your liking.[3] 
If you entered the wrong passcode, you can enter it again. Entering the wrong passcode will bring you to a new screen that just says “---”. On that screen, hit the “back” button to go back and re-enter the passcode.[4] 
You can lock your thermostat or partially lock it again. From the thermostat’s home screen, press “Menu,” then hit the + or - buttons until the screen says “LOCK.” Hit “Select,” then choose which lock setting you’d like your thermostat to be on. Settings include:[5] 