On a WMF 1100 S, error 9516 means the right grinder is blocked. 9517 identifies the left grinder. Those meanings come from the North America WMF 1100 S User Manual, PDF page 102. Use the machine’s full model name: the broader WMF message guide covers other series, whose code meanings should not be applied to the 1100 S.
The error reports a blockage, not the price of a motor or a set of burrs. If the display has stopped the grinder, do not keep calling for drinks to see whether it frees itself.
The manual starts with power off
WMF’s procedure begins by switching the machine off and disconnecting its mains plug. It then describes a model-specific hopper multitool and grinder-disk procedure. We do not reproduce that mechanical procedure here. A tool that happens to fit is not a substitute for the specified tool or safe access.
With the machine off and unplugged, you can record which hopper is affected and whether the problem began after refilling or routine cleaning. Keep hands and objects out of the grinder. If the plug cannot be reached safely, leave the unit stopped and tell the technician.
Why the grinder needs diagnosis
The manual’s next branch considers the grind setting if the blockage cannot be cleared, then calls for service if the problem remains. That is why we want the sequence of events before recommending parts: this is a fault to investigate, not an automatic motor-replacement instruction.
Have the affected grinder checked
Contact us with the 1100 S model details and the exact error. Mention any previous unblocking attempt so we do not mistake a changed condition for the original fault. Leave a recurring blockage for diagnosis rather than adjusting both grinders to chase one warning.
Independent WMF repair uses a model-dependent commercial espresso deposit of $200–$450. Pickup, bench diagnosis and return delivery are included; the deposit does not count toward the repair bill. The booking team confirms the deposit for the machine, and repair work is quoted after inspection.
Source: WMF 1100 S User Manual, North America, physical PDF page 102. Grinder meanings here are limited to the 1100 S edition, not every machine with a WMF badge.