A leak at the steam nozzle of your WMF LUMERO machine is generally caused by blockages or a lack of regular maintenance. Here’s how to identify and resolve the issue:
Immediate cleaning after each use: This is the primary cause of leaks. After each preparation of foam, clean the steam nozzle immediately to prevent milk residues from drying and blocking the internal conduits. On your WMF LUMERO, to clean the nozzle: place a container under the steam nozzle, activate the steam button to release hot water, then pull the steam nozzle tube down. Carefully clean the tube and nozzle with warm water, then reattach the tube in place.
Regular descaling of the machine: The accumulation of limescale inside the conduits and boiler causes blockages that lead to leaks. Your WMF LUMERO has a descaling alarm that activates when necessary. When it triggers, immediately start the descaling program which lasts up to 90 minutes. Regular descaling not only prevents leaks but also extends the lifespan of the machine.
Checking the detachable tube: Ensure that the steam nozzle tube is properly reattached after cleaning. If the tube is not properly fitted, water will escape during steam production. Also, check that the tube is not cracked or damaged.
Replacing the seal if necessary: If after a complete cleaning and descaling the leak persists, the seal of the nozzle housing may be worn. In this case, contact WMF customer service to have the seal of the nozzle housing replaced.
Diagnostic test: Test the leak by placing a container under the steam nozzle and activating the steam production button. Observe if water escapes from the tube itself or from the junction with the nozzle. This will help you identify exactly where the leak is coming from.
