Robot lawnmower displays E15 and stops; often associated with erratic navigation or spinning in place.

Safety first: Turn OFF the mower and disconnect the charging station before opening covers.

• Remove magnetic sources: Ensure there are no strong magnets, large speakers, or metal structures very close to the charging station or boundary wire that could disturb the compass.
• Inspect sensor module: Locate the compass/orientation sensor on the mainboard or as a separate module. Check that it is firmly mounted and its connector is secure.
• Calibrate if available: If the Einhell model supports compass calibration, follow the user manual to perform a calibration routine in an open area away from metal objects.
• Check for damage: Look for signs of impact or water damage around the sensor. Replace the module if it appears damaged.
• Test navigation: After adjustments, run a short mowing cycle and observe if the mower still spins or shows E15. Persistent errors indicate a defective sensor or mainboard.