Home-How » How to Unlock a Honeywell Thermostat? (5 Models)

How to Unlock a Honeywell Thermostat? (5 Models)

If you’re like most homeowners, you probably have a Honeywell thermostat controlling the climate in your home. These reliable thermostats can be easily locked to prevent unauthorized changes.

However, sometimes these thermostats are locked by accident. In this article, we’ll show you how to unlock your Honeywell thermostat so you can get your house or office back to a comfortable temperature. Let’s get started!

When Should You Lock Your Thermostat?

Many thermostats, including the Honeywell thermostat, have a lock feature that can be used to prevent someone from changing the temperature.

While the lock feature can be helpful in certain situations, it’s essential to know when and how to use it. Here are a few cases in which it is handy to lock your thermostat.

1. Rental

If you have a rental property, such as an Airbnb, you should lock your Honeywell thermostat. This is because if a guest breaks the thermostat, you will be responsible for the costs of repair or replacement.

However, be sure to keep the thermostat at a comfortable temperature. if the thermostat is set too high or too low, it can result in a lower rating from guests.

2. Children at home

If you have kids in your home, you may want to consider locking your thermostat. This will prevent them from accidentally changing the temperature, which can lead to discomfort or even danger.

Once the thermostat is locked, you can rest assured that your children won’t be able to change the temperature, keeping everyone in your home safe and comfortable.

3. Business owners and managers

If you’re a business owner or manager, you may want to consider locking your thermostat.

This can prevent employees from tampering with the temperature settings, which can help to ensure that the workplace is comfortable for everyone.

Unlocking a Honeywell Thermostat

Unlocking a Honeywell Thermostat

There are several types of Honeywell thermostats, so the process for unlocking them will vary depending on the model. Most models come with instructions on how to unlock it.

However, if your instruction manual was thrown away or it’s misplaced, here are the steps on how to unlock a few of the most popular Honeywell thermostat models.

1. How to unlock the Honeywell 8000 series thermostat

If you have a Honeywell 8000 series thermostat and are wondering how to unlock it, the process is quite simple.

If you know the passcode for the thermostat, simply enter it on the prompt. After you enter the passcode, simply tap “done.” Next, press “menu”, then “security settings” and tap “unlock”. If you do not know the passcode, there are a couple of ways to find it.

The first option is to remove the thermostat’s faceplate. The passcode will be a 4-digit number on a sticker in the top right corner.

If the sticker is missing, you can still find the four-digit code. When it asks for the passcode, select “cancel,” then use the arrow buttons to find “equipment status.” After you are in the equipment settings menu, scroll down until you see “date code”. This number is the passcode to your device.

Now, you can enter the passcode and unlock your thermostat. To lock the thermostat, go to the “menu,” usually located in the top right corner of the screen, and use the arrow buttons to scroll down to “security settings” and then “Change lock mode.” From here, you can select full lock or partial lock.

To change the password, use the arrow buttons to go to the security settings option. Select “Create password,” then enter the four-digit passcode of your choice. After the password is changed, you must use the new passcode to gain access to the thermostat.

2. How to unlock the Honeywell t6 series thermostat

If you have a t6 Pro Series Smart Thermostat, unlocking it is very straightforward. Simply press the center button on the front of the thermostat, under where it says “unlock.”

Next, enter the four-digit passcode. The default password on this model is “1234”. From here, use the plus/minus buttons to change the number up and down. When you get to the correct number, hit the “select” button.

Do this after each number until you have entered all four numbers. Press the “select” button again, and your thermostat is unlocked.

To lock this model, press the center button, which is the menu button. Press the “+” button until you see the word “lock.”

Press “select,” then use the “+” button again to either set the thermostat “on” for full lock or “part” for partial lock”. Press the “select” button again, and your thermostat is now locked.

If you have a t6 Pro Series Z-Wave Thermostat, you can unlock it by following the same steps.

3. How to unlock the Honeywell t4 series thermostat

How to unlock the Honeywell t4 series thermostat

If you have a Honeywell t4 series thermostat, there are a few different ways to unlock it. The first thing you’ll need to do is locate the “unlock” button. This is usually the button on the bottom center of the keypad. Once you’ve found the unlock button, press it, and this should allow you to input a 4-digit pin. The default code is usually “1234”. Press the +/- buttons to change the numbers up and down, then tap the select button. Keep doing this until you have selected all four numbers, then tap select again. Your thermostat should now be unlocked if you input the correct passcode.

4. How to unlock the Honeywell RTH8500D thermostat

Unlocking or locking this type of Honeywell thermostat is a bit different than other models but is still fairly simple.

First, tap the “system” button on the left side of the screen. Hold and press the 2nd and 4th buttons on the bottom of the screen for 5 seconds.

Next, use the arrows on the left side to scroll to the number “0670”.

Lastly, use the up or down-arrow button located on the right side or the middle of the screen to change the settings. To unlock completely, set the number to 0.

To change the temperature temporarily but allow the temperature to resume its programming during the next scheduled change, select 1. If you want to lock the thermostat fully, select 2.

Once you have made your selection, select “done.”

5. How to unlock a Honeywell FocusPro 5000 and 6000

These thermostats are often found in apartment buildings and are meant to prevent the tenant from changing the temperature past a certain level. However, this is easy to bypass.

To adjust the heat, hold down the button under “fan” or “auto” and the up button until the display changes.

Next, press the next button until you get to the number 27. From here, you can use the up and down keys to change the temperature. If you want to adjust your thermostat to cool your home down, hit the next button until you get to 28.

Now, you can turn your temperature down as low as you would like. When you have your temperature set to your preference, hit the done button, and you are finished.

What Else You Should Know About Honeywell thermostats

What Else You Should Know About Honeywell thermostats

1. What are the different lock settings on the thermostat?

If you have a Honeywell thermostat, you may be wondering what the different lock settings do. The functions are the same on every model, and the one you should choose depends on your preferences and circumstances.

  • Part or partial- The Partial Lock feature on your Honeywell thermostat can be used to protect your settings from being accidentally changed. When the Partial Lock is enabled, you will still be able to change the temperature manually, but you will not be able to access the menu or change any other settings.
  • On- When the lock is set, only someone with the four-digit code can change the settings or the temperature.
  • Off- When the lock is set to “Off,” your thermostat is not locked, and anyone can access the settings to make changes or change the temperature.

2. How do I find the thermostat model number?

If you are unsure which model your thermostat is, the first place you should check is the ID card that came with your thermostat.

If you no longer have your ID card, you can find it on your thermostat. Gently remove your thermostat’s faceplate, and the model number will be on the back. Most Honeywell thermostats have the same steps to unlock, so even if your model isn’t listed here, it is likely that you can follow the instructions to unlock your system.

If you still cannot unlock your thermostat, try searching for the specific model number online for instructions on how to unlock it

3. Why is my lock settings malfunctioning?

If you have an issue with your thermostat locking on its own or refusing to unlock, it could be that the thermostat batteries are low.

A low battery on your thermostat can cause a range of issues, leaving you with an uncomfortable temperature in your home. Most models with Wi-Fi will alert you when your batteries are low, so make sure you check your notifications.


That’s all there is to it! Now you know how to easily unlock your locked Honeywell thermostat so you can get your temperature where you want it. We hope you found this article helpful. Let us know in the comments if you have any questions or concerns.

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