Coffee maker brews but makes very loud buzzing or rattling noises during operation.

Safety first: Unplug the coffee maker before moving or tilting it.

• Level the unit: Place the coffee maker on a flat, stable surface. Adjust its position so all feet contact the counter evenly.
• Add a mat: Place a thin rubber or silicone mat under the machine to dampen vibration.
• Descale: Run a descaling cycle to reduce cavitation noise caused by scale in the heater and pump.
• Check for loose parts: Gently shake the unplugged unit; if you hear internal rattling, an internal screw or bracket may be loose and should be tightened by a technician.

Persistent loud mechanical noise often indicates worn pump mounts or a failing pump assembly.