What can cause a false alarm? December 02, 2022 14:56 Updated The most common sources of interference are: Water vapor, sharp frying, whirled-up dust and large temperature fluctuations. Related articles How do I shut down the RM L 3100 smoke detector if the false alarm cannot be stopped? What can I do if a smoke alarm has a malfunction or false alarm? Is it possible to manually turn off the warning sound in case of a false alarm? How often do I have to change the battery of my smoke detector? How often do I need to test or maintain the smoke alarm?