Products - Multi zone - The temperature in my Evohome zone drops considerably, without me asking for it.

Do you see a large temperature gap between your control panel and radiator valve? Then it is possible that the open window function is switched on on your radiator valve. When this is the case you will see the message "WINDOW". This means that the radiator controller closes when a window is open for the purpose of saving energy. When you close the window, it starts heating again. Please note That the function also switches itself on when it detects drafts.

Is there no open window and do you still see the "WINDOW" message? Then you can disable this function by following the steps below:

1. Go to "menu" via your control panel. Hold down the button until the warning screen appears and press the checkmark.
2. Select ‘zone configuration’ and click on the zone where the button is located.
3. Click on "parameters" and click on "window open" and then choose "disabled"