Honeywell RTH9580WF smart thermostat, displaying its -Screen Locked- message.
Some models of the Honeywell Home thermostat, including the RTH9580WF we discuss in this post, feature a screen lock mode. This prevents anyone from changing thermostat settings without first entering a pass code. You create this code when you lock your thermostat. Later, the thermostat asks you to enter this password to regain access. So here we show how to lock and unlock Honeywell Home thermostat. Furthermore, we demonstrate this on Honeywell’s RTH9580WF model. We assume here that your thermostat is fully open (not in lock mode) to start with.
Find the MENU button in top right corner of the screen, which then displays the main menu screen. Once there, you may have to press the down-arrow button a few times to locate the Security Settings item. The next picture shows the main menu, already scrolled, to reveal this option.
The Security Settings screen then displays.
So this brings up the Change Lock Mode screen. Note that the Unlocked option appears in a brighter blue. This means that the thermostat is currently in open mode. Thus, people can access all settings and schedules without unlocking it first. But we are now going to lock it.
This again displays the Change Lock Mode screen, but now, shows that Fully Locked option highlighted in the bright blue. The thermostat will go into fully locked mode once you press the Done button in the next step.
Note that we could have tapped the Partially Locked button here instead. If we had, that option would appear in the next screen shot. But in this demo, we’re only showing what happens with the Fully Locked mode.
However, you establish partial locking in the same way as shown below in the Fully Locked case. But the difference is that after locking, you’ll have access to some of the thermostat’s settings. These include the current temperature setting on the Home screen. But with full locking, you’ll be able to access none of the settings, without first unlocking the Honeywell Home thermostat.
This takes you back to the Security Settings screen. Your thermostat is now in full lock.
Note that if you wish not to set up a passcode, you can skip ahead to step 9 below. The Honeywell Home will still in lock, even with no passcode in effect. So you won’t need a password therefore, to unlock it. However, here we’re going to add one nonetheless, to demonstrate the comprehensiveness of the locking mechanism on Honeywell Home thermostats.
The password-created screen then displays. This shows a four-digit passcode. Now be sure to remember this code, because you’ll need it to unlock the unit later.
So be careful not to misplace or forget this passcode. Indeed, record it somewhere and keep it safe. Without it, you’ll be unable to gain access to the controls. Nor will you be able to reset the thermostat to factory defaults without calling Honeywell for help.
Tapping Done returns you to the Security Settings screen. This shows that the Create Password button is now the Remove Password button.
The Previous Menu option returns you to the main menu.
Find the Home link in the top left corner of the screen, as arrowed above. This returns you to the Home screen. The unit is now in full lock mode.
Try tapping the up and down arrows that adjust the current temperature setting. These buttons we circle in pink in the previous picture, at screen right. When the thermostat is in full lock mode, any attempt to change the temperature produces the Screen Locked screen. If you get this page, your RTH9580WF is now in lock mode. Thus you cannot adjust it at all without the passcode. See below for how to unlock.
Note that you may view current thermostat status and settings while locked; you just can’t change anything.
Fully locked mode prevents any changes to settings at all, including the current temperature.
All locked modes (full and partial) disallow the following main menu items. When locked, these do not appear when you view the thermostat’s main menu.
Either lock mode permits access to the following status menu items.
Partially locked mode disallows the same main menu functions as fully locked mode. However unlike fully locked mode, partially locked mode allows you to change the current temperature setting.
The screen lock mechanism, and Security Settings password feature, function somewhat independently of each other. Yet they are related. So You may lock the screen either with or without setting a password. Also you may set a password that fences the Security Settings functions, without actually locking the screen.
If a password is in effect, you’ll need it to enter the Security Settings menu. Why? Because the password restricts only the access to the Security Settings main menu function.
But the lock screen restricts access to certain main menu items as well as the temperature buttons. These two functions are related in that, to lock or unlock, you need access to the Security Settings menu item. So, if you have set a password, then you’ll need that password to unlock. If you didn’t set a password, then you won’t need one.
Firstly, find the MENU button in top right corner of that page.
This then displays the main menu screen. Again, you might have to press the down-arrow multiple times to find the Security Settings item.
The next picture shows the main menu, already scrolled, to show the Security Settings option.
A password protected Honeywell Home thermostat then shows the Please enter your password prompt screen.
Enter the code you assigned when you password-protected the thermostat. In this demo, our security code was 2752. So, we tap the UP and DOWN arrows above and below each number position. Thus in this way, we can enter the correct digit for each position.
Again, all that entering this password correctly does, is allow access to the Security Settings menu. This is where you can then either completely unlock, partially lock, or remove the Security Settings password altogether.
Tap Done once you’ve punched in the passcode, the thermostat then shows the Security Settings screen.
So from here, you could choose either to delete the Security Settings password. Or just choose to change the lock mode while leaving the existing password in effect. Furthermore, you need not remove the password to unlock the thermostat. Nor must you change the lock mode to remove the password.
Then the Change Lock Mode screen again displays, that shows the Fully Locked option highlighted in blue.
This unlocks the thermostat and returns you to the Security Settings screen.
This returns you to the main menu. Note that all menu items are now available. So verify this by scrolling down through them. If you see that various menu items, then your unit is indeed now open.
Finally, you are now free to change any setting you wish on the main menu. Thermostat unlocking is now complete thus.
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