1. Check whether the "keep warm after boil" switch in Mi Home App (off by default) is off. Turn it on and then boil the water. 2. Check whether the function of "lifting the pot memory" is off, and pick up the water after boiling Pass the kettle. 3. After turning on "keep warm after boil" and "lift the pot memory", try to boil the water again. 4. If it still cannot keep warm, after-sales inspection is required to see if the kettle is faulty.