How to Keep a Honeywell Smart Thermostat Secure

Introduction

Locking your Honeywell Thermostat is a good way to keep guests or children from changing your thermostat’s settings while still letting you and your family adjust your home’s temperature within the range you’ve set. Unless someone has the four-digit PIN that you create when locking your Honeywell Thermostat, they won’t be able to unlock the thermostat or change any of the thermostat’s settings.

1 Determine Product Type

Honeywell Thermostats:

  • Wi-Fi Smart Thermostat
    Wi-Fi Smart Thermostat

  • Lyric Round Wi-Fi Thermostat - Second Generation
    Lyric Round Wi-Fi Thermostat

  • Lyric T5 Wi-Fi Thermostat
    Lyric T5 Wi-Fi Thermostat

? What type of thermostat are you using?

  1. Wi-Fi Smart Thermostat
  2. Lyric Round Wi-Fi Thermostat - Second Generation
  3. Lyric T5 Wi-Fi Thermostat

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Locking your Honeywell Thermostat is a good way to keep guests or children from changing your thermostat’s settings while still letting you and your family adjust your home’s temperature within the range you’ve set. Unless someone has the four-digit PIN that you create when locking your Honeywell Thermostat, they won’t be able to unlock the thermostat or change any of the thermostat’s settings.

Honeywell Thermostats:

  • Wi-Fi Smart Thermostat
    Wi-Fi Smart Thermostat

  • Lyric Round Wi-Fi Thermostat - Second Generation
    Lyric Round Wi-Fi Thermostat

  • Lyric T5 Wi-Fi Thermostat
    Lyric T5 Wi-Fi Thermostat

You can adjust security options to prevent unauthorized changes to system settings.

  1. Touch Settings and select Security Settings.
    Settings menu with Security Settings selected. Screenshot.

  2. Select Change Lock Mode.
    Security Settings with Change Lock Mode selected. Screenshot.
  3. Select an option and follow prompts:
    • Unlocked: Full access allowed.
    • Partially locked: Only temperature can be changed.
    • Fully locked: No access allowed.
      Change Lock Mode screen with Unlocked, Partially Locked and fully locked options.
  4. You can choose to use a password for additional security too.

The Lyric Round Wi-Fi Thermostat does not offer a thermostat screen lock.

  1. On the thermostat home screen, touch Menu.
  2. Touch the Arrows until you see Screen Lock, then touch Select.
    Screen Lock selected. Screenshot.

  3. Touch the Arrows to choose your screen lock setting, then touch Select.
    • Partial Lock: Only the temperature can be changed.
    • Full Lock: No access is allowed without a PIN number.
      Screen lock type selection. Screenshot.

  4. Write down the Pin number that will appear on the screen and keep it in a safe place.
  5. Touch Select, and confirm your screen lock setting by touching Yes.
    PIN number selection screen. Screenshot.

    Confirm lock? Yes.
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