the grinder on my ECAM37095TI is super loud and makes a screeching noise, only when grinding.

Diagnosis

The screeching noise during the grinding cycle on the De'Longhi Dinamica Plus ECAM37095TI is typically caused by "foreign object interference" or "burr misalignment" due to debris. Because this model utilizes high-grade ceramic burrs, they are incredibly hard but brittle. When a small stone, a piece of hardened coffee bean, or a metallic fragment enters the grinding chamber, it becomes lodged between the upper and lower burrs. As the motor forces the burrs to rotate, the object creates a high-pitched, metallic screeching sound as it is compressed or scraped against the ceramic surface. If the noise is a consistent, high-frequency whine rather than a sporadic screech, it may indicate that the lubrication on the drive shaft has dried out or that the grinder is struggling against an overly fine setting that has caused "clumping" or "bridging" in the hopper. To confirm, check if the noise persists when you change the grind setting dial (located inside the bean hopper) to a coarser setting. If the noise remains identical across all settings, you have a physical obstruction lodged in the teeth of the ceramic burrs.

How to Fix It

To clear the obstruction and restore quiet operation, follow these precise steps:

1. Power down the machine completely using the main switch and disconnect the power cable from the wall outlet to prevent accidental activation of the grinder.
2. Open the bean hopper lid and empty all remaining coffee beans into a container. Use a vacuum cleaner with a narrow nozzle attachment to suck out any loose beans or grounds from the hopper throat.
3. Locate the grind adjustment dial inside the hopper. Rotate it to the coarsest setting (the highest number) to create the maximum possible gap between the ceramic burrs.
4. Using a high-intensity flashlight, inspect the grinding chamber. Look for small pebbles, pieces of plastic, or "petrified" coffee beans that have hardened over time.
5. Use a stiff-bristled nylon brush (a clean, firm toothbrush is ideal) to vigorously scrub the gaps between the burrs. Rotate the brush in the direction of the grind to push debris outward.
6. If a fragment is visible but stuck, use a pair of plastic tweezers to gently extract it. Do not use a metal screwdriver or needle, as scratching the ceramic burrs will create permanent "burrs" on the material, leading to uneven grinds.
7. Once cleared, manually rotate the grinder shaft (if accessible) or simply reassemble and run a "test grind" without beans to see if the screeching has subsided.

If That Didn't Work

• Perform a "Purge Cycle": If the obstruction is small and organic (like a hard bean), fill the hopper with a small amount of very hard, light-roast beans. These are denser and can sometimes "push" the obstructing fragment through the system during the grinding process.
• Deep Clean the Grinder Path: Remove the infusion unit (the brew group) and check the chute where the ground coffee enters the brew group. Sometimes a blockage at the exit of the grinder causes back-pressure, which manifests as a strained, screeching motor sound. Clear any compacted "pucks" from the chute using a pipe cleaner.
• Adjust the Grind Setting: If the noise is a whine rather than a screech, your setting may be too fine. While the machine is running (and grinding beans), slowly turn the adjustment dial one notch coarser. Only adjust the dial while the grinder is active to avoid stripping the plastic gears.
• Inspect for Burr Fracture: If you hear a rattling sound accompanying the screech, a ceramic burr may have cracked. Ceramic is prone to chipping if a stone is processed. If a fragment of the burr has broken off, the entire grinder assembly must be replaced as ceramic burrs cannot be repaired.

Heads Up

• Bean Quality: Only use high-quality, "stone-free" coffee beans. Cheap, bulk-buy beans often contain small pebbles that will instantly shatter ceramic burrs.
• Dial Adjustment Warning: Never turn the grind adjustment dial while the grinder is stationary. This can put undue pressure on the mechanism and cause the dial to snap or the burrs to misalign.
• Avoid Oily Beans: Extremely oily dark roasts can cause "clumping" in the ECAM37095TI, which puts strain on the motor and mimics the sound of a blockage.
• Regular Vacuuming: Every 500 cups, vacuum out the bean hopper area to prevent old, rancid coffee oils from hardening into "rocks" that interfere with the burrs.