A sudden harsh sound, stalled burr or motor strain on BES878 and SES878 calls for an immediate stop. Empty the hopper and inspect the removable upper-burr area dry; never keep pulsing through a hard obstruction.
This page is for abnormal mechanical noise or a grinder that slows and stops, not a normal change in grind pitch as the hopper empties. Small stones or hard debris can travel with beans, while compacted oily grounds can load the burrs. The user-safe boundary ends at the hopper, removable upper burr and brush-accessible outlet shown by Sage.
Follow the checks in order and change only one condition at a time. Run a short rinse or test after each action, so the result identifies the cause instead of hiding it. The procedures below stay within the cleaning, refitting and user-menu operations described by the manufacturer.
Models covered
Safety first
- Unplug before opening the hopper area and keep the grinder dry. Never place fingers, metal tools or a vacuum nozzle against the lower burr, and do not run the motor with guards removed.
What the symptom may indicate
Checks in the right order
- Stop at the first abnormal sound
Release the grind control immediately. Switch off and unplug rather than testing the noise several more times.
- Empty and unlock the hopper
Remove beans by hand from the unplugged machine, turn the empty hopper to unlock and lift it away. Do not reach into the lower burr.
- Lift the upper burr and inspect
Record its adjustment, use the handle to unlock the upper burr, and inspect the exposed dry chamber for a loose hard object. Remove only debris that lifts out freely.
- Brush, refit and test briefly
Brush dry residue from burrs and outlet, restore the recorded setting and locks, then test with a few inspected dry beans. Stop immediately if the noise returns.
Stop and get qualified help when
- Do not restart if a hard object is wedged, a burr edge is chipped, the upper burr will not seat and lock, the motor smells hot, or the same harsh sound returns during the small test.
Next step
Repair, replace a part, or arrange a diagnosis?
Use the checks and stop conditions above to choose the least costly safe next step. A symptom alone never proves that the appliance has failed.
Resolve it without buying anything
Complete the 4 safe checks in order. If normal operation returns and no warning sign remains, no replacement is indicated.
Replace only the confirmed part
If the checks isolate a worn or blocked component, match its complete reference to the exact appliance model before ordering.
This guide does not identify a replacement part. Do not order a generic component from the symptom alone.
Arrange a diagnosis before replacing the appliance
Stop at any warning sign listed above. A qualified diagnosis should confirm that repair is unsafe, unavailable or uneconomical before an appliance replacement is considered.
Stop and get qualified help when : 1
Compare replacement appliances on AmazonPaid Amazon search. Results are suggestions, not a diagnosis or a recommendation to discard the appliance.Sources used
- Sage — The official Barista Pro manual separates steam, grinder blockage, abnormal noise and dose-setting checks for BES878 and SES878.
- Sage — Sage documents removal and cleaning of the Barista Pro hopper and upper conical burr, without opening the appliance body.
Last checked: 29 August 2026