When does the guarantee expire? February 03, 2023 08:56 Updated If you open a product or carry out technical interventions If own fault of the defect is present If the guarantee period of the originally purchased device has expired (replacement devices do not extend or renew the guarantee period) Related articles How can I submit a complaint about a brennenstuhl® product? What does the legal warranty cover? What is the difference between guarantee and warranty? Why is the switch on my brennenstuhl® multiple socket outlet defective? How do I shut down the RM L 3100 smoke detector if the false alarm cannot be stopped?