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Mahlkönig Grinder Troubleshooting

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Row of coffee grinders in a coffee shop - Mahlkönig grinder troubleshooting

Quality and consistency in a cup of coffee are not always easy to achieve on a daily basis, let alone in a commercial setting. Having state-of-the-art coffee grinding equipment that doses accurately, creates the perfect ground-to-water ratio and extracts rich flavors that jolt morning commuters awake can elevate your business from a small-scale-mom-and-pop shop to a massive, nationwide corporate chain.

However, when coffee machines break down, it throws a wrench not just into your morning routine but to all those who count on your place of business for their caffeine fix. To mitigate downtime, Parts Town has curated a guide on Mahlkönig grinder troubleshooting for the E65S, E65S-GBW, DK15, DK27, EK43, X54, K30 and Guatemala models.

Not Grinding or Buzzing 

If your Mahlkönig grinder is not grinding, buzzing or otherwise turning on, this could indicate a problem with the machine’s electrical connections. Sometimes, the motor overheats or the unit switches off because of an electrical overload. Whatever's causing the issue, try these Mahlkönig grinder troubleshooting tips to get it back up and running. 

Problem 

Solution

Grinder not plugged in 

Plug in the grinder’s power cord

Thermal overcurrent circuit breaker tripped 

Turn the power switch to the off position and push the circuit breaker’s release button back in 

Blown fuse 

Replace the fuse 

Not Turning On 

These machines come equipped with a series of safety features in case of overheating, overcurrents and overloads. So when Mahlkönig coffee grinders don’t turn on, you’ll also want to check the electrical connections.

Problem

Solution

Grinder not plugged in 

Plug in the grinder’s power cord

Overload circuit breaker tripped 

Turn the power switch to the off position and push the circuit breaker’s release button back in 

Blown pre-fuse

Replace the pre-fuse

Motor protector tripped 

Let the grinder cool off for 1 hour

Bean hopper not installed 

Install the bean hopper 

Not Grinding But Is Humming 

When the grinder is humming but not working, it means it still has power but something is blocking the grinding mechanism. Check the following areas to troubleshoot your Mahlkönig grinder.

Problem

Solution

Grinding mechanism is blocked 

Change the grind setting to coarse

Grounds too fine 

Set the grind degree to 10 

Foreign object in grinding mechanism 

Remove the foreign object and clean the grinding mechanism

Not Grinding Fine Enough 

Espresso beans usually need that ultra fine grind to bring out the strong flavor profiles of your bean while creating that much sought-after signature crema. However, when you don’t find those two things in your cup, you should call the professionals to sort out the issue with your grinding machine’s burrs.

Problem

Solution

Faulty burrs 

Please contact an authorized service technician 

Misaligned burrs 

Please contact an authorized service technician 

Keeps Shutting off

If your Mahlkönig grinder keeps shutting off, you’ll want to call in some professional help to take a look at a couple of the switches.

Problem

Solution

Faulty start button 

Please contact an authorized service technician 

Faulty portafilter switch

Please contact an authorized service technician 

Not Dosing Properly 

Every coffee aficionado knows that the coffee ground to water ratio is of utmost importance, but especially when you’re serving paying customers. Inaccurately measured grounds can result in a watered-down or bitter, over-extracted cup of joe. Here are some Mahlkönig grinder troubleshooting tips to restore your coffee recipe’s delicate flavor profile:

Problem

Solution

Clogged spout 

Turn off the grinder and clean the spout with a brush. Then, change the grind setting to coarse and run the machine 

Damaged spout 

Please contact an authorized service technician

Dirty or faulty flapper 

Dirty or faulty flapper 
Please contact an authorized service technician 

Not Vibrating 

The basket vibrator on your coffee grinder is essential for optimal flavor extraction and to prevent clumping and clogging. When this doesn’t work, you’ll want to call your favorite service technician to replace the eccentric rod.
Bean Hopper Isn’t Attaching  

If you can’t get the hopper on your coffee grinder, it’s because there are coffee beans lodged in the intake and are preventing it from locking in place. Go ahead and remove the beans, and you should be good to go and grind.

Problems

Solution

Beans in hopper intake 

Remove the beans 

Improperly positioned rubber ring

Align rubber ring so it lies flat against the intake

Grinder Lid Isn’t Attaching

Sometimes, the lid doesn’t go on straight away. This can be easily fixed with a few minor adjustments.

Problem

Solution

Improperly installed burr flange

Align the burr flange 

Improperly installed adjustment ring 

Align the adjustment ring 

Grinder Rotates but Doesn’t Grind 

There’s a couple of reasons why your grinder rotates without creating coffee grounds. Check out these Mahlkönig grinder troubleshooting tricks below.

Problem

Solution

Damaged carrier 

Remove the grinder cover and replace the driver 

Incorrect motor polarity 

Please contact an authorized service technician 

Dirty hopper magnet 

Clean the hopper magnet 

Grinder Not Depositing Grounds Properly 

If you notice that the grinder is not depositing the coffee grounds in the center of the portafilter, you might need to adjust the spout’s positioning on your machine.

Need more guides for your coffee grinder? Check out our large selection of Mahlkönig manuals and diagrams for model-specific tips and tricks.

Please contact a local authorized service agent who can help with these specific units and all your commercial kitchen equipment needs.