Why does my heater's open window detection keep stopping the heat?

If your heater keeps stopping because of open window detection, the appliance is likely sensing a sudden temperature drop and pausing the heating cycle to save energy. This can happen near a draughty window, an outside door or a cold wall. Stop using the heater if the detection seems erratic, the room becomes unsafe, or the appliance behaves unpredictably.

1. Check whether a window or door is open nearby. Close it, then wait for the heater to stabilise and test again.
2. Move the heater away from direct draughts and cold spots. A sensor too close to a window can trigger the function repeatedly.
3. Confirm whether open window detection is intentionally switched on. If it is, switch it off temporarily and see whether the heating resumes normally.
4. Make sure the heater is not in fan mode, because the supplied manual states that open window protection cannot start in fan mode on the relevant model.
5. If the function still interrupts heating even in a stable room, stop using the heater until the retailer can advise the next steps.

If the issue remains unresolved or safe use is uncertain, contact the retailer or store where the product was purchased. The supplied manuals describe open window detection as a feature on several heater models and explain that it responds to a sudden drop in room temperature.