STIHL iMOW 3 EVO: Intermittent outside-boundary / internal error

What this fault means

An older iMOW can run normally and later lose boundary interpretation or report internal errors.

Safety: Stop the mower and follow the manufacturer safety instructions before physical inspection.

Step-by-step checks

1. Note whether another compatible mower works on the same dock/loop; this is a strong installation-vs-mower discriminator.
2. Inspect the mower for moisture history and connector contamination only where service access is appropriate.
3. Check whether the error follows the mower to a known-good installation.
4. Avoid replacing the boundary loop when a second mower proves the loop is healthy.
5. Escalate mower-side receiver/control electronics with the exact code.

Evidence source: Manufacturer/support reference

Evidence checked 2026-08-25. Diagnostic procedures are labelled separately from manufacturer-exact error instructions.

Did one of these checks actually fix the mower?

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