- Garden
- Robot lawnmower
No loop signal
Husqvarna Automower 'No loop signal': robot mower stopped
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
The Automower stops because it does not receive the boundary wire signal. Look at the charging station lamp: off means no power, flashing blue means the boundary wire is loose or broken. Check the outlet, the RCD and the connections before calling service.
Safety first
Stop and check this first
- Do not open the power supply or the charging station. Unplug the supply from the outlet before cleaning or touching the station and never clean it with running water or a pressure washer. Husqvarna requires an RCD of maximum 30 mA and recommends disconnecting the supply and all wires if there is a risk of thunderstorm.
Safe checks you can perform
- Charging station indicator lamp
- Boundary wire connections
- ECO mode and new loop signal
Leave these tasks to a qualified professional
- Do not attempt this professional task: Locating the wire break
- Do not attempt this professional task: Power supply and station check
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Locating the wire break
What they doThe dealer locates the broken section of boundary wire, replaces it with new wire and splices it with an original coupler, as Husqvarna specifies.
They must show youthe station lamp solid green after the repair.
In writingwhere the break was, the section replaced and the coupler used.
Power supply and station check
What they doIf the lamp stays off with a working outlet and RCD, or turns red, the service checks the power supply, the low-voltage cable and the station circuit board.
They must show youthe measurement or test that identifies the faulty part.
In writingthe part replaced, that it is original and the final test result.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Charging station indicator lamp
- Who:
- you, looking from outside.
- How:
- look at the indicator lamp on the charging station. Per the manual, solid or flashing green is correct, flashing blue means the boundary wire is disconnected or damaged and red means a fault for the service technician.
- Result that matters:
- knowing whether the problem is power, the boundary wire or the station itself.
- If the lamp is off:
- check the power outlet, the residual-current device and that the low-voltage cable is connected to the station.
- If the lamp is solid or flashing red:
- do not tamper with the station and contact Husqvarna service.
- Evidence to keep:
- photo of the station lamp and of the mower display showing the message.
Evidence: Husqvarna Automower 405X/415X Operator's manual (1650-006 EN)
Boundary wire connections
- Who:
- you, with the power supply unplugged from the outlet.
- How:
- first disconnect the power supply from the outlet, as the manual asks before maintenance on the station. Check that the boundary wire connectors are fitted properly to the charging station and are not damaged.
- Result that matters:
- both ends of the boundary wire properly connected.
- If a connector was loose:
- refit it, plug the supply back in and see if the lamp turns green.
- If the lamp still flashes blue:
- the wire may be broken; find the break as the manual describes or ask your dealer.
- Evidence to keep:
- photo of the connections and of the lamp colour afterwards.
Evidence: Husqvarna Automower 405X/415X Operator's manual (1650-006 EN)
ECO mode and new loop signal
- Who:
- you, from the mower display.
- How:
- if you use ECO mode, put the mower in the charging station, start it and close the hatch. If pairing may be lost, with the mower in the station go to Security > Advanced > New loop signal and wait for confirmation (about 10 seconds).
- Result that matters:
- the mower recognising its station's signal again.
- If the mower starts normally:
- the cause was ECO mode or pairing.
- If 'Connection NOT changed' appears after several tries:
- Husqvarna refers you to an authorised service technician.
- Evidence to keep:
- note of the steps taken and the message shown.
Evidence: Husqvarna Automower 405X/415X Operator's manual (1650-006 EN)
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Garden
- Brand
- Husqvarna
- Product type
- Robot lawnmower
Known code variants
- Automower 415X No loop signal
- Automower No loop signal
- Automower sin señal de lazo
- Gardena robot mower no boundary wire signal
- Gardena SILENO no loop signal
- Gardena SILENO sin señal de lazo
- Husqvarna Automower No loop signal
- Husqvarna Automower sin señal de lazo
- Husqvarna robot mower no loop signal
- No loop signal
- robot cortacésped Husqvarna sin señal
- robot Gardena sin señal cable delimitador
- SILENO city no loop signal
- SILENO city sin señal de lazo
- SILENO life no loop signal
- SILENO life sin señal
- Sin señal de bucle
- Sin señal de lazo
What it means
In the Husqvarna Automower 405X/415X operator's manual (1650-006, 2023), 'No loop signal' means the mower does not detect the signal the charging station sends through the boundary wire. Husqvarna lists a power supply or low-voltage cable that is not connected or damaged, a loose or broken boundary wire, ECO mode, a wire crossed around an island, lost pairing or metal interference as causes. Other Automower models may show this message with different causes. The message alone does not prove that a part is faulty.
Warnings and stop conditions
- Higheditorial warning
Do not open the power supply or the charging station. Unplug the supply from the outlet before cleaning or touching the station and never clean it with running water or a pressure washer. Husqvarna requires an RCD of maximum 30 mA and recommends disconnecting the supply and all wires if there is a risk of thunderstorm.
Evidence: Husqvarna Automower 405X/415X Operator's manual (1650-006 EN)
Symptoms and causes
Probable causes · in order
- No power at the charging stationCommon
The power supply or low-voltage cable is not connected or is damaged; the charging station status lamp stays off.
Evidence: Husqvarna Automower 405X/415X Operator's manual (1650-006 EN)
- Boundary wire loose or brokenCommon
If the boundary wire is not connected to the station or has been cut (for example with a shovel), the station lamp flashes blue.
Evidence: Husqvarna Automower 405X/415X Operator's manual (1650-006 EN)
- ECO mode on and started outside the stationPossible
With ECO mode active the station switches off the wire signal; if the mower tries to start outside the station, this message appears.
Evidence: Husqvarna Automower 405X/415X Operator's manual (1650-006 EN)
- Lost pairing or crossed wirePossible
Husqvarna lists lost pairing between mower and charging station and a boundary wire crossed on its way to and from an island.
Evidence: Husqvarna Automower 405X/415X Operator's manual (1650-006 EN)
- Interference from metal or buried cablesLess common
Fences, reinforcement steel or buried cables close to the boundary wire can weaken the signal the mower receives.
Evidence: Husqvarna Automower 405X/415X Operator's manual (1650-006 EN)
Virtual technician
Does No loop signal still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Husqvarna Automower 405X/415X Operator's manual (1650-006 EN)
Husqvarna · 2023 · manual
- 2
Husqvarna Automower 405X/415X Manual de usuario (1650-006 ES)
Husqvarna · 2023 · manual
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