As we get back to the daily grind, making sure that your commercial bean to cup coffee machine is ready for the year ahead is of utmost importance to the quality of your beverages and your coffee machine maintenance routine.

Today we will be looking at the importance of your bean to cup coffee machine grind size and how getting it right doesn’t just help produce the perfect cup, but also ensures that the brewer component in your coffee machine operates correctly.

As every bean to cup coffee machine is slightly different, we’ve chosen to focus on WMF commercial bean to cup coffee machines.


Setting your bean to cup machine coffee grinder to the right size doesn’t just improve the taste of your coffee, it ensures that the machine will operate correctly. If your grounds are too course or fine this will impact the flavour of the coffee by either limiting flavour extraction or producing a very bitter taste. You should be looking to achieve a ‘medium-coarse’ or ‘medium-fine’ grind.


At the time of installing your machine we will have set the machine up to run at an optimum level, however you can of course adjust the grind size yourself on your WMF machine. At the top left hand side of the machine there is an opening which when using the correct tools supplied can be tightened/adjusted to correct the grind size.

TOP TIP: If your coffee grind is just right and you want to adjust the strength of the coffee, simply use the machine interface to do this, not the grind size. On the bottom right of your WMF machine interface you will find your ‘strength’ setting signified by 3 coffee beans. We recommend a 2/3 bean setting.

TOP TIP: When you have found the setting which suits you and your staff, we recommend only one person at the company manages the machine. This ensures that multiple staff aren’t regularly adjusting machine operations which can be problematic to maintenance routine and settings.


While the flavour of your coffee is of course paramount, a lack of maintenance on the brewer component is one of the most common causes of machine failure. Fortunately on these machines it’s easy to maintain as the component is relatively universal across the WMF range.

The reason behind the brewer component malfunctioning is also relative to the grind size. When the brewer compresses the ground beans into a ‘puck’, if the grind is too fine or course the grinds will not get compressed and collapse/overflow into other components of the machine. This is course causes blockages and machine failures.

The best way to maintain the brewer is to clean it. To do so, simply remove the waste tray, drip tray, catch tray and then lastly the brewer unit. The brewer is housed centrally to the machine and once you have taken the trays out reach into the machine and gently pull down, squeezing the release catch which will then unlatch the brewer unit from the machine.

Now wash it thoroughly. It’s absolutely fine to completely submerge the unit in water and we recommend removing and cleaning the brewer once weekly.

TOP TIP: Do not remove the side panels from your coffee machine to reach the brewer, you won’t be able to and you may cause damage to the machine and components. If you are experiencing technical difficulties, please call us on: 0800 085 0065.

If you have any questions in respect of how to maintain your coffee machine, why not get in touch with our experts for help over the phone? Call Logic Vending on: 0800 085 0065