undefinedFebruary 16,2022

How to Unlock Honeywell Thermostat [Step-By-Step Guide]

Every person desires to be in control of their home comfort. We all have a different sense of space and response to a spatial environment that we don’t like getting tampered with. Now, with technology and innovation, the marketplaces have come up with high-value products that let consumers take necessary control of their device behavior. When it comes to the thermal comfort of our interiors, Honeywell Thermostat stands as a notable smart device that isn’t only energy and cost-efficient but also offers a collection with the lock feature. Yes! you read it right, you can unlock Honeywell thermostats! 

If you are wondering what the lock feature is all about and whether or not you even require it, we have you covered.

The locking and unlocking feature of Honeywell Thermostats help users to block out instances of temperature settings being tampered with, especially in households with highly energized kids. Besides, the thermostat lock eliminates the probability of sudden temperature alterations, making our lives a bit simpler.

It’s important to note that Honeywell Thermostats have several models with this locking and unlocking attribute, but the functioning slightly varies around the range. Therefore, every Honeywell Thermostat user should ensure that the locking and unlocking guideline they are following is of their installed model only.

Whether or not you are tech-savvy if you are exploring and learning more about your Honeywell Thermostat, good job! You have found the best guiding article for you. 

Which Thermostat Models Are Offering the Lock Feature?

At present, the locking/unlocking feature is offered in the Honeywell Pro series thermostat manual unlock and 8000 series. 

This largely includes:

  • Honeywell TH4110D
  • Honeywell T6 Pro Series Z-Wave
  • Honeywell T6 Pro Series Smart Thermostat
  • Honeywell 8000 series
  • Honeywell T4 Pro series

How Does the Honeywell Thermostat Lock Mode Work?

unlock honeywell thermostat


The operability of the Lock mode function is founded on the Personal Identification Number (PIN). This code initially is preset as a default code. One can easily reset this to the desired PIN post-installation. While there’s a possibility to retrieve it, noting it down is always better.

Conscious of varying schedule and user patterns, this locking system comes in two lock settings-Partial lock and Full lock.

What Is the Difference Between a Partial Lock and a Full Lock?


Honeywell Thermostats offer two locking systems. In models that feature partial locking, the functioning is similar to a large extent. As the name itself suggests, this locking system offers users partial access to the unit. With the way in, the user acquires permission to alter the temperature.

In other words, the feature is preferential for people whose user pattern is mostly a case of manual temperature handling and wouldn’t like a schedule setting fearing regular overrides.

The full lock feature on Honeywell Thermostat cancels entry to the keypad. Consequently, it prevents any undesired access to the temperature settings. It’s important to note that this full ingress can be sought only with the correct entry of the PIN. 

A user can avail complete authority to override settings once the PIN gets noted. This stands true until the feature is activated to lock mode again. Comparatively, the full lock feature is a better option for people who don’t make frequent or regular alterations to their thermostat temperature settings or general settings.

Can the Locking Mode Be Disabled on the Honeywell Thermostat?

Absolutely! The primary reason how to unlock a Honeywell thermostat is to regulate who gets the permission to control device settings. Nevertheless, if you don’t wish to activate the locking mode, the device has an OFF mode that can permit you to disable the locking system.

How to Unlock Honeywell Thermostat?

The most crucial and common requirement to unlock and lock your Honeywell Thermostat is to make sure that you remember your correct Personal Identification Number (PIN). As the process is slightly variable in various models, we have elaborately listed the guide to locking and unlocking for dissimilar thermostat models separately below:

1. T4 Programmable Thermostat

unlock honeywell thermostat


The T4 Programmable Thermostat is an all-around product by Honeywell featuring full-lock capabilities. Making use of the PIN functionality, these come with a default set PIN code. 

To Unlock the T4 Programmable Thermostat, you can follow these simple steps:

  1. Find the center button marked as ‘Unlock’.
  2. It shall allow you to proceed with entering the default PIN or your reset PIN, conditioned to what stage you are performing the unlocking.
  3. Use the +/- keys to set the number in the correct order of your PIN.
  4. Once you enter the correct PIN, the thermostat will automatically unlock and allow you to access the settings freely.

To Lock this thermostat model, you need to perform a manual selection, using these simple steps:

  1.  Find the menu button.
  2. Press lock. This can be navigated using the +/- symbols.
  3. Select this lock setting and confirm your choice. It shall drive the thermostat unit to lock mode.

2. T6 Pro Series Z-Wave Thermostat

unlock honeywell thermostat


The T6 Pro Series Z-Wave Honeywell Thermostat is equipped with all three locking options modes – partial lock, full lock, and unlock mode for you to regulate your device control. 

Know how to unlock the Honeywell Pro series Thermostat, this can be achieved with these simple steps:

  1. Find the lock symbol on display. It shall prompt you to enter your device PIN.
  2. Use the +/- button on your device to correctly enter the digits of your PIN.
  3. Once you enter the correct PIN, the thermostat will automatically unlock and allow you to access the settings freely.

The locking process for the thermostat is also pretty easy. Read these simple steps to assist the process:

  1. Press the menu button on your display and navigate to screen lock.
  2. Select the screen lock option. This shall allow you to choose between the partial lock and full lock.
  3. Finalize your desired setting and confirm your PIN by selecting the yes option when prompted on-screen.

3.T6 Pro Series Smart Thermostat

unlock honeywell thermostat


The Honeywell T6 Pro Series Smart Thermostat aside from the locking and unlocking characteristic is also popular for its LED display, smart utility tools, and user-friendly design. The unlocking feature for this model is rooted in the PIN system, similar to other models. An easy guide to the process is listed below:

  • On the menu display, search for lock and press it.
  • Use the +/- symbols to enter your PIN digits followed by pressing the select button to confirm it.

As far as the locking configuration for the thermostat model is concerned, you can follow these steps:

  • On the menu navigate for the screen lock.
  • Post selecting the screen lock, choose your desired mode of screen lock i.e. partial lock or full lock.
  • Press select and finalize your setting by pressing yes.

4. Honeywell 8000 Series Thermostat

unlock honeywell thermostat


Honeywell 8000 Series Thermostats are more advanced units that apart from locking and unlocking features are enabled with smart functionings like WiFi. The unlocking guide of this series is slightly different from other module steps. The process of unlocking for models like VisionPro TH8321WF and VisionPro models RedLINK is shared below:

  • Press the menu and find security settings on the display.
  • Then press the select button and enter your PIN.
  • Pressing did unlock the unit

For models like RTH8500, the unlocking steps are mentioned as under:

  • Find the system button and hold it down for a few seconds.
  • In the lower center of your device, find the blank button and hold it until the display changes.
  • Change the digit value on the left side to your PIN or default code (0670).To change this value you can use the up and down keys.
  • Change the digit on the right side to 0. This can again be done using your up and down keys.
  • Press did on your screen and unlock your thermostat system.

For locking your Honeywell thermostat models like VisionPro Series TH8321WF or VisionPro with RedLINK, you need to follow these steps:

  • On the Menu button, locate your security settings.
  • Navigating with arrows, select the ‘create a password’ or ‘change lock mode’.
  • At this step, you can also create your password if not done earlier.
  • Proceed and click the send button to complete thermostat locking.

For models like RTH8500 and TH8000, the locking steps are mentioned as under:

  • Find the system button on your display.
  • In the lower center of your device, find the blank button and hold it until the display changes.
  • Change the left values to your PIN digits or the default PIN if you haven’t reset the code.
  • Change the right value for lock settings by selecting either the option of partial lock or full lock.
  • Press Done to complete the process of locking.

What Will Happen If You Forget Your Honeywell Thermostat Pin Code?

unlock honeywell thermostat


Forgetting your PIN is quite a situation we often come across as an aftermath of our daily life rush. In such a case, the fear of basing your thermostat system on a PIN code can be intimidating. However, with Honeywell Thermostats any such situation can be easily dealt with.

The Honeywell Thermostat PINs are four-digit numbers that let you access your device temperature settings. In case you forget your password, the thermostat provides you with an opportunity to recover your PIN.

With simpler models like T4 Pro, the process can be as simple as entering the default company code (1234). 

However, in the case of advanced models or changes of PINs, the following steps can be followed:

  • Remove the faceplate of the template.
  • Check the four-digit code written.
  • Add 1234 to the code you looked at in the previous step.
  • The summation of the number is the PIN for the device.

Post this recovery, you can continue with the set PIN or utilize information as guided above in the article to change your thermostat code.

Is Installing a Honeywell Thermostat Benefiting You?

We all want the best return to our investments, substantially if the product directly concerns our habitat and lifestyle. Using Honeywell Thermostats, consumers are gaining the power to customize their devices. The Honeywell Thermostat offers them an opportunity to schedule or manually modulate their preferred temperature range while also granting them a sense of security by not allowing mishandling of their device.

By and large, the unique proposition that makes it worthy of investment is the degree of personalization it offers to allow everyone to cherish thermal comfort as per their own household needs. Isn’t that a definite quality we would want in our house products?

For more information on home improvement, visit HouseDecorationTip.



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