
If you’re facing issues with your Honeywell T4 thermostat and need to unlock the keypad, you’re in the right place! This blog post will guide you through the steps to unlock your thermostat and ensure your home remains comfortable. Plus, we’ve included a helpful video at the end to assist you visually.
Why Unlock Your Honeywell T4 Thermostat?
The Honeywell T4 thermostat is a fantastic device for managing your heating and cooling systems efficiently. However, sometimes the keypad may get locked, preventing you from making necessary adjustments. Whether you accidentally locked it or need to change settings, unlocking it is a straightforward process.
Steps to Unlock Your Honeywell T4 Thermostat
Method 1: Using the Buttons
- Press and Hold the Left and Right Buttons: Simultaneously press and hold the left and right buttons on your thermostat for five seconds. This simple method is usually effective for unlocking the keypad.
Method 2: Using the Password 1234
If the first method doesn’t work or you prefer to use a password, follow these steps:
- Press the Center Button: Start by pressing the center button on your thermostat.
- Change the First Digit: Use the up or down arrows to change the first digit of the password.
- Press Select: Once you’ve set the first digit, press the Select button.
- Repeat for Remaining Digits: Continue this process for the second, third, and fourth digits of the password, pressing Select after each digit.
- Final Selection: After entering all four digits, press Select again.
If the code is incorrect, you’ll see the screen flash “–)”. Simply press Back to return and enter the correct number.

Forgot Your Password? 1234
If you’ve forgotten your password, don’t worry! You can reset your Honeywell T4 thermostat:
- Locate the Reset Button: This button is usually found on the front or side panel of the thermostat.
- Press and Hold: Hold the reset button for about 5 to 10 seconds. This will reset the thermostat back to factory settings.
- Reprogram: After resetting, refer to the manufacturer’s instructions to reprogram your thermostat.
Conclusion
Unlocking your Honeywell T4 thermostat is a simple process that can be accomplished in just a few steps. Whether you choose to use the button method or the password method, you can regain control of your home’s climate in no time.
For a more detailed visual guide, make sure to check out the attached video that walks you through each step.
If you’re in Corpus Christi, Texas, and need further assistance, feel free to reach out to local HVAC professional Justice Inc. who can help with your thermostat and other heating and cooling needs.
Unlock your Honeywell T4 thermostat today, and enjoy a comfortable living environment all year round!