Question 1

Should I turn off or leave the WMF LUMERO coffee machine on standby after each use?

Accepted Answer

The WMF LUMERO does not need to be turned off after each use as it has an automatic standby mode. After 30 minutes of inactivity, the machine automatically goes into standby mode, thereby optimally reducing its energy consumption.

For normal daily use:

Leave the machine in standby mode between close uses (less than 30 minutes). The 1-cup selection button will light up red, indicating standby mode.
Clean immediately after each use, especially the steam nozzle after making cappuccino or milk, to prevent clogging from milk residues.

For prolonged inactivity (several hours or more):

You can leave the machine in standby mode without risk.
If you plan to be away for several days or more, unplug the machine from the wall socket to completely cut off the power supply.

The automatic standby mode after 30 minutes is designed to protect the internal components and save electricity without any action on your part. Therefore, you do not need to press the on/off button after each coffee: the machine manages it automatically.

Question 2

Why is the steam nozzle of my WMF LUMERO machine leaking when making an espresso?

Accepted Answer

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.

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