How to Unlock Honeywell Thermostat (Updated)

The best of us are prone to accidents, and what accident is more frustrating than having your device locked? Be it the scorching heat or extreme cold that you are stuck in, being trapped under the mercy of your thermostat due to accidentally locking it can be a curse. This is why we bring forward to you how to unlock a Honeywell thermostat if such a situation persists.

Honeywell is a renowned one when it comes to putting our life at ease through thermostats, offering everything between manual thermostats to WIFI thermostats (that come with adjustable settings) and, of course, programmable thermostats. Let’s see how to unlock one.

How to Unlock Honeywell Thermostat

Now, why does the front panel lock itself and give you all these troubles of unlocking? Pretty easy to understand if you compare this with your phone. Have you ever faced a situation where you are sitting with your friends, gossiping about your boss and his ill issues when inside your pocket, somehow a call has been sent to him, and he’s listening to all your woes to take a jab the next day? You’re lucky if you haven’t. Or none of these could happen, and you may have locked it yourself. Whatever tampering occurred, you now need to unlock the thing.

To unlock it, you will need to use a four-digit code. In some cases, by default, they set “0000”. But you can have your own combination of numbers to have it unlocked. But here is a piece of advice that had better come with your Honeywell thermostat instructions: you have a time window to perform what we instruct below. Because if you aren’t pressing a button under 10 seconds, the stat will timeout, exit the screen you’re working on and enter the standard screen.

Without further ado, here are the steps:

1. Hold the Next button for five seconds and find Enter Code.
2. Enter the code used to lock the thermostat recently. Press Up/Down buttons to change the flashing digits.
3. Hold the Next button for another 5 seconds.
4. Your thermostat is now unlocked.

For mainly the T4 thermostat from Honeywell, there will be a couple of changes:

1. Start with the home screen.
2. Press the central button.
3. Enter the passcode. It is 1234 by default.
4. If that isn’t the code that is showing, to enter your system, use the “+”/ “-” buttons to change the first flashing digit. Then press Select and keep changing the other ones till your code gets displayed on top—finally, press Select.
5. Your thermostat is now unlocked.

How to Lock it Back Again

Now that you have unlocked it, say, you want to lock it yourself for some reason, like not letting the babysitter change the setting. What do you do?

1.  Enter the “System” mode.
2. In the “Run” position, find “Set slide.”
3. Keep holding the “Next” button for five seconds, and you’ll find “Set code” and “Lock code.”
4. You can select your required code, be it your own or a default 0000/1234.
5. After you have done this, You can use the “Up/Down” buttons to change the flashing digits, and when you’re done, press the “Next” button for another five seconds as you’ve done before.
6. Now, your screen will return to the home screen or the normal one, whatever you call it.
7. To show that you did it right, there will be a padlock on the screen saying that it is locked.

What to Do If You Forget Your Lock Pass

If you, like a brave warrior, attempted to lock it and like a goldfish forgot the passcode you just set, here is what you will need to do: reset the thing.

To Reset Honeywell Thermostat

There are two ways you could do the reset, one is manually and the other one is through the machine.

In order to reset, you will need to do the following:

1. In the Run position, select Set Slide.
2. Take your thermostat circuit board, and at the back of it, find HW RST.
3. This stands for Hardware Reset. You will need to hold the button for three seconds or more and release it.
4. The thermostat is now reset by itself.
5. You will see a normal unlocked screen on the panel.

To follow the other way, reset the Honeywell thermostat by:

1. Press the off button and turn your thermostat off.
2. Remove the screws without damaging your device. Take special care when removing the screws from near the screen.
3. Now you need to remove the batteries. You can slip in a coin, use the tweezer, or lever them out. By all means, get them out!
4. Insert the batteries back in opposite orders. That is the negative pole of the battery to the positive pole of the battery bed.
5. This position has to be maintained for five to seven seconds.
6. Now that you’re done, wait and place them back as standard batteries and screw things back together.
7. Your thermostat should be unlocked.

Conclusion

It would be best if you had now learned how to unlock and reset a Honeywell thermostat. We hope the next time you fall into such situations; you remember your humble friends, that is us!