WMF Automatic Coffee Machine Error Code 9678: Right Grinder Blocked

What does WMF error code 9678 mean?

When the right grinder cannot turn its burrs, the motor strains and the control sees it. To avoid burning out the motor, the machine stops using that grinder and displays code 9678. Drinks that depend on the right hopper are no longer available, and staff see the code in place of them. What jams a grinder is usually foreign: a stone that traveled with the beans, a bean that wedged between the burrs, or beans that have packed together. A grind set too fine makes jams more likely, since the motor is working against less clearance. The owner's manual describes how to free it from the hopper side: unplug the machine, take off the hopper, turn the grinder disk counterclockwise using only the hopper multitool, then clean the hopper and put it back. Frequent repeats suggest either a coarser setting or worn burrs.

Affected models and control systems

This applies to the WMF 5000 S+ and to the WMF 1500 F with internal storage, right bean hopper side, per the WMF 5000 S+ user manual section 8.2.

Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.

What you may notice

• Code 9678 on the display
• Right-hand coffee drinks unavailable
• Strained grinding sound before the stop
• Beans not dropping into the right grinder

Possible causes

Listed in WMF's documentation

• Stone or foreign object in the beans
• Beans compacted in the right grinder
• Grinding degree set too fine
• Grinder motor and burr wear

Other likely causes — what usually sits behind error code 9678 on this control. A technician confirms which one it is before any part is replaced.

• Foreign object in a bulk bag refilled into the right hopper
• Moisture from a wet scoop making beans stick together
• Burrs worn so unevenly that beans catch at one point

Safe checks before calling for service

How a technician diagnoses error code 9678

1. Read the code and confirm it is the right grinder.
2. Remove the hopper and inspect the beans and the grinder inlet.
3. Turn the burrs by hand with power off.
4. Check burr wear and grind setting.
5. Measure motor current while grinding.
6. Replace burrs or the grinder motor if the readings support it.

How error code 9678 differs from similar codes

9678 and 9679 both mean the right grinder is blocked; 9619 is the left grinder.

Technical reference

Document

WMF 5000 S+ User Manual, 8.2 Error messages and malfunctions p.108-109

Edition

Series 1950 33 4186 6010, 08.2022 (copyright 2018-2022 WMF GmbH; dated 05.08.2022)

Models / control

WMF 5000 S+, WMF 1500 F (Internal Storage)

Section

8.2 Error messages and malfunctions, pp. 108-109 (error number table); errors 9678/9679/9619 grinder blocked listed on p. 110 (Errors without error message table)

Checked

October 2026

We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.