If your coffee machine grinder is not working, it usually means the machine cannot grind coffee beans properly, which prevents it from producing coffee. This issue is common across automatic bean-to-cup machines from brands like De’Longhi, Sage, Jura, Siemens, and Melitta.

The grinder is a critical component responsible for preparing fresh coffee grounds for brewing. When it fails, you may hear unusual noises, no grinding at all, or receive error messages depending on the machine.

Grinder issues can present in several ways depending on the severity of the fault.

You may notice that the machine makes a clicking or whirring sound but does not produce ground coffee. In some cases, the grinder may be completely silent when a coffee is selected.

Another common sign is the machine running a brew cycle but delivering no coffee, or displaying warnings such as “add beans” even when the hopper is full.

You may also see inconsistent grinding, where the machine produces too little coffee or stops mid-cycle.

One of the most frequent causes is blocked grinder burrs, usually due to oily or damp coffee beans. Over time, coffee oils can build up and cause the burrs to stick or clog.

Using incorrect or flavoured beans can also create residue inside the grinder, leading to poor performance or complete blockage.

A foreign object in the grinder (such as small stones sometimes found in low-quality beans) can jam the burrs and stop the grinder from turning.

Wear and tear is another factor. Over time, grinder burrs can become dull, reducing grinding efficiency and eventually leading to failure.

In some cases, the issue may be electrical, such as a failed grinder motor or a problem with the control board not activating the grinder.

Start by checking the bean hopper. Ensure it is filled with fresh, dry coffee beans and that no moisture has entered the hopper.

Remove any visible debris and ensure the beans are moving freely into the grinder.

If your machine allows it, adjust the grind setting slightly. Sometimes burrs can become stuck and adjusting the setting can help release them.

Listen carefully when starting a coffee cycle. If you hear no sound at all, this may indicate a motor or electrical issue. If you hear noise but no grinding, it is more likely a blockage.

Turn off and unplug the machine before attempting any cleaning.

If accessible, remove and clean the grinder area using a brush or vacuum designed for coffee machines. This helps remove built-up coffee residue.

Run a grinder cleaning cycle if your machine supports it, or use specialist grinder cleaning granules to clear oils and debris.

Avoid using water inside the grinder, as this can cause further damage.

If the grinder is jammed, carefully removing stuck beans or debris may restore function.

For worn burrs or motor issues, the grinder assembly may need replacing, which is typically an engineer-level repair.

If the grinder remains completely inactive, or if the machine displays persistent grinder errors, the issue may be with the motor, sensors, or control board.

Repeated jamming or loud grinding noises can also indicate internal damage to the burr set or gearbox.

In these cases, professional repair or part replacement is usually required.

Use high-quality, dry coffee beans and avoid flavoured or overly oily beans, as these are a major cause of grinder issues.

Clean the grinder system regularly using appropriate cleaning products.

Do not allow moisture to enter the bean hopper, and store beans in a dry environment.

Regular maintenance will help keep the grinder operating smoothly and extend its lifespan.

A coffee machine grinder not working is usually caused by blockages, worn burrs, or motor issues. Many problems can be resolved with cleaning and proper bean selection, but more serious faults may require component replacement or repair.