How to lock/unlock a Honeywell thermostat

You may need to know how to lock and unlock a Honeywell thermostat for various reasons. So let’s break it down, shall we?

You can quickly lock and unlock your Honeywell thermostat with a few simple steps, whether you own a building that is used by numerous people, such as a landlord, or you have children who love touching buttons. 

Before you can learn how to lock and unlock Honeywell thermostats, you must first understand when you should lock your thermostat, the variations in lock settings, and which Honeywell thermostat model you are using, as Honeywell has three major thermostat types. 

When Should Your Honeywell Thermostat Be on Lock? 

There are three main scenarios in which you might want to lock your thermostat. These are just a few:

The owner or building manager 

Suppose you own an office building and have the legal authority to control the temperature. In that case, you can lock or partially lock your thermostat to maintain a uniform temperature across the facility.


If you’re the happy owner of an Airbnb, you may opt to keep the thermostat set at a certain level to save money on your power bill. This may also be useful to avoid temporary renters from forgetting to turn off the heat.


If you have children who like to press and touch things they shouldn’t, you might want to lock your thermostat to save your power bill from skyrocketing. 

Settings to Lock and Unlock 

When you glance at your thermostat’s display screen, you’ll notice one of three things. 

  1. It will display ‘off’ if the Thermostat is on unlock mode
  2. Indicates ‘part’ if it is partially locked, allowing the temperature to be changed but no other settings to be changed. 
  3. It will say ‘on’ if it is entirely on lock mode; indicating that no settings may be modified until it is set to unlock. 

If you’re having trouble clearing the schedule on your Honeywell Thermostat, see our particular post for a solution.

What is the procedure for locking and unlocking a Honeywell thermostat? 

To lock and unlock a Honeywell thermostat, the most popular method is to go to the lock screen and enter the correct key code, followed by “SELECT.” 

Honeywell thermostats are divided into three categories: T4, T6, and 8000. Each type of thermostat has its own set of instructions to lock and unlock. 

First, figure out which thermostat you’re using, and then follow the instructions for that model.

Honeywell T4 Thermostat

This section will show you how to lock and unlock the Honeywell Thermostat model T4.

Locking the Honeywell T4 thermostat

The T4 model features three locking steps: 

  1. To lock your thermostat, go to the menu option. 
  2. Select your lock mode with the +/- buttons. 
  3. Press ‘Select’ to confirm. 

Unlocking a Honeywell T4 thermostat? 

To unlock the T4: 

  1. You’ll be requested to enter a 4-digit password after you press the word ‘Unlock’ on the screen. 
  2. The default password is 1234 if you haven’t put one up. 
  3. To choose each digit of the password, use the +/- buttons. 
  4. By pressing ‘Select,’ you may advance to the next digit. 
  5. Your thermostat will be unlocked once you have selected ‘Select’ after inputting the last digit and the password is approved.

Honeywell T6 Thermostat

This section will show you how to lock and unlock the Honeywell Thermostat model T6.

Locking the Honeywell T6 thermostat

To lock the screen on the T6 model and prohibit full or partial access to the thermostat, follow these four steps. 

  1. By scrolling left or right with the arrow on the screen, locate the ‘Screen Lock’ option by tapping the center button labeled ‘Menu.’ 
  2. Select ‘Screen Lock’ once you’ve found it. 
  3. After that, lock your thermostat completely or partially. 
  4. When prompted, pick your desired locking mode, and when requested to confirm, choose ‘Yes.’ 

Unlocking the Honeywell T6 thermostat

A 4-digit PIN code is a need to unlock the T6 model. If you don’t know your PIN number, you’ll have to take a few more steps to get your thermostat unlocked. 

  1. Remove the front of the thermostat and look for a 4-digit number on the device to find the PIN. It’s normally in the upper right corner of the screen. 
  2. Once you’ve obtained the 4-digit number, multiply it by 1234 to get your thermostat’s PIN number. 
  3. When you’re ready, tap the lock icon to unlock your thermostat.
  4. Enter your four-digit PIN. Enter the PIN using the arrow keys and the select button. 
  5. Your thermostat should be entirely unlocked if you enter the PIN properly and press ‘Select’ once you are done.

Honeywell 8000 Thermostat

This section will show you how to lock and unlock the Honeywell Thermostat model 8000.

Locking Honeywell 8000 Thermostat

There are five fundamental stages to locking the Honeywell 8000 thermostat. 

  1. Locate and press the ‘System’ menu item on the touch screen. 
  2. On the left side, you’ll notice four digits. You must alter those digits to ‘0670’ using the arrows. This is your security code. 
  3. A single digit, either a one or a zero, appears on the right side. This is how you decide whether you want your thermostat to be totally or partially locked. 
  4. Use the arrows to fully lock it, and make sure the digit is one. Make sure the digit is zero if you want it partially locked. When the device is partially locked, you can still modify the temperature. 
  5. After entering the PIN and locking mode, confirm by pressing ‘Done,’ and your smartphone should be locked. 

Unlocking a Honeywell 8000 Thermostat

The techniques for unlocking the Honeywell 8000 thermostat are similar to those for locking the thermostat. 

  1. To start the unlock operation, press and hold ‘System’ and ‘Auto’ together instead of hitting ‘System.’ 
  2. Then, at the bottom of the screen, you should notice a blank area in the center. Hold the blank key down until the screen changes. 
  3. On the left side, you’ll notice four digits. You must alter those digits to ‘0670’ using the arrows. This is your security code. 
  4. Instead of selecting one of the two locking modes, you’ll use the arrows to set the digit on the right to zero to unlock the thermostat. 
  5. After entering the PIN and selecting zero, click ‘Done’ to complete the process, and your thermostat should be unlocked.


This is another option presented to users by Honeywell, in which it takes 12 hours for a temporary hold on a thermostat to be lifted.

If your thermostat is set on permanent hold, you’ll have to manually override it to get it off.

How can you get rid of a Honeywell thermostat’s hold? 

Changing the thermostat temperature is all it takes to break a momentary hold. 

Furthermore, to release a permanent hold, press the “+” and “-” buttons together, then hit “Cancel.” 

In summary

Locking and unlocking Honeywell thermostats is relatively straightforward as long as you have your PIN or password. Whether you’re attempting to keep the kids away from the thermostat; or want to adjust the temperature in a building or Airbnb that you own. 

The Honeywell Thermostat makes it easy for any user to lock and unlock or hold the temperature of the home or workplace.

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