How to Keep Your DeLonghi Coffee Grinder Clean and Working Well

What makes DeLonghi grinders different and how to care for them

DeLonghi coffee grinders come in two main types: burr grinders, which crush beans between two rotating surfaces, and blade grinders, which chop beans with a spinning blade. Burr models (like the DeLonghi KG79 or KG210) are more common in their lineup and produce a more consistent grind size, which matters for flavor. Blade models are simpler and cheaper but grind less evenly. Both types need regular cleaning to prevent oil buildup from beans from gumming up the mechanism and affecting grind quality.

The reason DeLonghi grinders need attention is that coffee beans release oils as they're ground, and those oils stick to the burrs or blades and the interior walls. Over time, old oil turns rancid and can make fresh coffee taste stale or bitter, even if your beans are fresh. A clean grinder also runs more smoothly and lasts longer before parts wear out.

Key Takeaways

• Unplug your DeLonghi grinder before cleaning any internal parts, and never immerse the motor housing in water.
• For burr grinders, remove the upper burr (if your model allows it) and wipe both burrs with a dry cloth or soft brush at least once a month.
• Blade grinders should be cleaned by running uncooked rice through them to absorb oils, then emptying the rice and wiping the bowl with a dry cloth.
• The hopper and grounds container can be washed with warm soapy water and dried completely before reattaching.
• Never use water inside the grinding chamber itself, as moisture can cause rust and electrical problems.

Cleaning the burrs on your DeLonghi burr grinder

If your DeLonghi has burrs, the best cleaning happens when you can access them. Many DeLonghi burr models have a removable upper burr that twists or slides out. Check your manual for your specific model number—the KG79, KG210, and KG520 all have slightly different designs. Once you've unplugged the grinder, locate the upper burr and gently remove it by turning it counterclockwise or sliding it straight up, depending on your model.

With the upper burr out, use a dry soft-bristled brush (an old toothbrush works) or a clean, dry cloth to brush away ground coffee and oil residue from both the upper burr and the lower burr that stays in place. Work gently—burrs are precision parts and can be damaged by hard scrubbing. Wipe the inside walls of the grinding chamber with a dry cloth as well. Once clean, reinstall the upper burr by reversing the removal steps, making sure it sits flush and secure.

If your DeLonghi model doesn't have a removable burr, you can still clean around the edges by running a dry brush along the seams where the burrs meet the housing. Do this monthly or whenever you notice the grind becoming uneven or the motor sounding strained.

Cleaning blade grinders with rice

DeLonghi blade grinders like the KG40 don't have burrs to remove, so the cleaning method is different. The safest way to clean the grinding chamber is to run uncooked white rice through the grinder. The rice is hard enough to knock loose stuck coffee particles and absorb oils, but soft enough not to damage the blade. Use about a quarter cup of rice, grind it for 10 to 15 seconds until it becomes powder, then empty the grounds into the trash.

Repeat this process two or three times if the grinder hasn't been cleaned in a while. You'll notice the rice powder becoming darker as it picks up old oil. Once the rice powder comes out light and clean, your blade is ready. Empty any remaining rice dust, then wipe the inside of the bowl with a dry cloth or paper towel to remove any lingering powder.

Washing the hopper and grounds container

The hopper (where you pour beans) and the grounds container (where ground coffee falls) can be removed and washed with warm soapy water. Unplug the grinder first, then twist or slide these parts off according to your manual. Wash them in warm water with a small amount of dish soap, scrubbing gently with a soft sponge or cloth to remove any oily residue or stuck grounds.

Rinse thoroughly under running water until no soap remains, then dry completely with a clean cloth or paper towel before reattaching. Moisture left inside these parts can drip into the motor housing when you reassemble, so make sure they are completely dry. Let them air-dry for a few minutes if you're unsure.

What not to do when cleaning your DeLonghi

Never submerge the motor housing or any part with electrical connections in water. Never use a damp cloth inside the grinding chamber itself—water and electricity don't mix, and moisture can cause rust on metal parts. Don't use harsh solvents, bleach, or abrasive scrubbers, which can damage the finish and internal components. Avoid compressed air, which can blow dust into seals and bearings.

Don't force any removable parts if they won't come loose easily. If the hopper or burr is stuck, unplug the grinder and wait a few minutes, then try again gently. Forcing parts can strip threads or crack plastic. If something feels wrong or won't budge, consult your manual or contact DeLonghi customer service rather than risk damage.

How often to clean and what to watch for

A light cleaning of the hopper and grounds container should happen every week or two if you grind daily. A deeper cleaning of the burrs or blade should happen at least once a month. If you grind less frequently, monthly is still a good baseline. If you notice the grind becoming uneven, the motor sounding strained, or the coffee tasting stale even with fresh beans, clean immediately—these are signs that oil buildup is affecting performance.

Store your DeLonghi in a cool, dry place away from direct sunlight and moisture. Keep the power cord coiled loosely and don't wrap it tightly around the grinder, which can damage the insulation over time. If you won't be using the grinder for more than a few weeks, run it empty for a few seconds to clear any remaining grounds, then store it with the hopper and container removed and dried.

Troubleshooting common DeLonghi grinder problems

If your grinder won't turn on, check that it's plugged in and the outlet works. Make sure the hopper is seated properly—most DeLonghi models have a safety switch that prevents the motor from running if the hopper isn't fully attached. If the motor runs but no grounds come out, the grinding chamber may be jammed with old, hardened coffee. Unplug the grinder, remove the hopper, and use a dry brush to clear the jam gently.

If the grind is uneven or too coarse or fine, the burrs may be misaligned or dirty. Clean the burrs as described above, then check that the upper burr is seated correctly. If the grinder is very loud or vibrating, stop using it immediately and unplug it—this can mean a burr is damaged or the blade is bent. Contact DeLonghi support for repair options rather than continuing to use it, as a damaged grinder can fail suddenly or produce unsafe grounds.

Frequently Asked Questions

Can I use water to clean inside the grinding chamber?

No. Water inside the grinding chamber can cause rust, electrical shorts, and mold growth. Use only dry cloths, brushes, and dry rice (for blade grinders). The hopper and grounds container can be washed with water and soap, but the motor housing and grinding chamber must stay dry.

How do I know if my DeLonghi has burrs or blades?

Check your manual or look at the model number on the bottom of the grinder. Burr models usually have "KG" followed by numbers like 79, 210, or 520. Blade models are often simpler and cheaper, with names like KG40. If you open the hopper and see two round, textured surfaces facing each other, you have burrs. If you see a single spinning blade at the bottom, you have a blade grinder.

What should I do if the upper burr won't come out?

Make sure the grinder is unplugged and the hopper is removed. Try turning the burr counterclockwise very gently—don't force it. If it's stuck, wait a few minutes and try again. If it still won't budge, it may be jammed with hardened coffee. Use a dry brush to work around the edges where the burr meets the housing, then try again. If it remains stuck, contact DeLonghi support rather than risk breaking it.

Can I grind spices or other things in my DeLonghi coffee grinder?

You can grind spices, but clean the grinder thoroughly afterward because spice oils and flavors stick to burrs and can affect the taste of your next batch of coffee. Run uncooked rice through a blade grinder or brush out a burr grinder with a dry cloth after grinding spices. If you grind spices regularly, consider keeping a separate grinder for them.

Why does my coffee taste stale even though the beans are fresh?

Rancid oil buildup in the grinding chamber is the most common cause. Clean the burrs or blade as described, wash the hopper and container, and try again. If the taste doesn't improve, the beans themselves may be old or stored poorly. Buy from a roaster with a recent roast date and store beans in an airtight container away from heat and light.