Honda Miimo HRM40: Boundary wire / signal problem
Use this diagnostic path to narrow the fault before buying parts. MowerFixAI is independent and does not claim manufacturer endorsement.
Error/code: Boundary wire signal
Likely causes
- Boundary wire, docking station or installation condition
Before replacing anything
Confirm the symptom is repeatable. Note whether it occurs at startup, during mowing, under cutting load, while returning to the dock, or only in one part of the lawn. Change one variable at a time and retest.
Step-by-step diagnostic procedure
- Check boundary wire, station power and installation against the model owner manual.
If the mower behaves normally after one step, stop there and monitor it before replacing parts.
Safety and escalation
- Stop the mower and follow the manufacturer shutdown/isolation procedure before touching blades, wheels, charging contacts or internal components.
Stop if the next step requires mains-voltage work, opening sealed electronics, battery-pack disassembly or a proprietary service tool. Use an appropriately qualified dealer for those procedures.
Parts that may be involved
- No replacement part should be ordered until the fault is isolated; inspect model-specific components named in the diagnostic procedure.
Do not order a part from the error message alone. A related component is not proof that the component has failed.
Evidence and model applicability
Grade B — Manufacturer/model-family evidence
{'model': 'Miimo HRM40', 'family': 'Honda Miimo family', 'scope': 'Manufacturer/product-family corroboration; exact menu names, limits and part numbers must be confirmed for this model.'}
If the fault is intermittent
Capture the exact message, LED state, battery percentage and mower location when it happens. Intermittent faults are often easier to isolate from the conditions surrounding the failure than from a restart after the event.
Run the complete model-aware diagnosis
Continue through MowerFixAI's interactive diagnostic workflow to compare this fault with related symptoms and next checks.
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