The heater has an “open window” function that activates as soon as the detected room temperature drops more than 5 degrees within 15 minutes. The heater will automatically stop heating, and “FO” will be displayed on the heater’s screen.
In “open window” mode, the heater maintains a temperature 5 degrees above freezing (to prevent frost damage). If the temperature increases by at least 3 degrees within 15 minutes, the unit will resume heating.
For Generation 3 heaters, follow the steps below to enable/disable the “open window” function:
To return the heater to normal mode, press the function button once.
To activate or deactivate the “open window” function, press and hold the function button for 3 seconds. You can also control this feature from the app if your heater is connected to WiFi.
The heater will remain in “open window” mode for a maximum of 1 hour, after which it will return to normal heating mode.
For Generation 3M heaters, follow these steps:
Press the menu button to enter the menu.
Use the + and - buttons to navigate until you see “Fo” on the display.
Press the button to enter the open window mode.
Use the + or - button to select “On” or “Off.”
Confirm your choice by pressing the button. You can also enable/disable the open window function from the app if you’re connected to Wi-Fi.