# Husqvarna Automower no loop signal and other error codes

Source: https://mowandedge.co.uk/blog/husqvarna-automower-no-loop-signal
Published: 2026-10-12
Publisher: Mow and Edge

**In short:** On wired Husqvarna Automower models, a no loop signal message usually means the mower cannot hear the boundary wire. The common causes are no power at the charging station, a loose wire connection at the station, or a break somewhere in the boundary wire. Check the station's indicator light and connectors first, then trace the wire. The exact wording and light behaviour vary by model, so use your manual and a Husqvarna dealer.

Husqvarna Automower models with a boundary wire rely on a signal sent round that wire by the charging station. If the signal stops, the mower stops too and shows a message, often worded along the lines of no loop signal. It sounds serious, but the cause is usually a cut wire, a loose connector or a power issue at the dock. This guide explains what the common messages generally mean, the order of checks, and how to find a wire break with simple tools. Note that wire-free models, such as EPOS and V models, do not use a loop wire and have different messages.

## What no loop signal usually means

The charging station sends a signal through the boundary loop. The mower listens for it to know where the edge of the lawn is. If the mower stops hearing it, it shows a message such as no loop signal and parks. On many models it will not start again until the signal returns.

The signal can stop for three broad reasons: the station is not powered or not sending, the wire is not properly connected at the station, or the loop is broken somewhere along its length. Less often, the station and mower need to be paired again after a part is replaced; some models offer a way to create a new loop signal in the settings menu, as the manual describes.

| Message (wording varies) | What it usually points to | First check |
| --- | --- | --- |
| No loop signal | No signal in the boundary wire | Station power, connectors, wire break |
| Outside working area | Mower has crossed the wire or wire is too close to an edge | Wire position, slopes near the edge |
| Trapped or stuck | Mower cannot move away from an obstacle | Ruts, roots, low edges |
| Lifted or upside down | Lift or tilt sensor triggered | Body cover, debris, steep ground |
| Guide wire problem | Mower cannot follow the guide wire home | Guide wire connection and route |

Common Automower messages and what they generally point to

Note: Messages, light signals and code numbers differ between Automower models and software versions. Do not rely on lists from forums. Check your model's manual or the Husqvarna support pages, and contact an authorised Husqvarna dealer for faults you cannot clear.

## Checks to do first, in order

Before tracing wire across the lawn, rule out the quick causes at the charging station. Many no loop signal messages clear at this stage, especially after a power cut, a tripped socket or someone knocking the station.

1. Press STOP and switch off the mower, or disable it as the manual describes.
2. Check the station's power supply is plugged in and the socket is on.
3. Look at the indicator light on the station; your manual explains what each state means.
4. Unplug power, then check the boundary wire ends are pushed fully into the station connectors.
5. Look for corrosion or green deposits on the connectors and clean or replace them.
6. Restore power, wait a moment, and see whether the station light and mower message change.

Note: Unplug the power supply before handling the station or wire connectors. Keep the transformer and outdoor socket dry, and use an RCD protected supply. Ask a qualified electrician for any new outdoor wiring.

## How to find a broken boundary wire

If the station is powered and connected but there is still no loop signal, the loop is probably broken. Think back to recent work: edging, digging a bed, laying turf, scarifying, aerating or putting in fence posts. Breaks are often right where that happened. Walk the wire route slowly and look for nicks, chewed sections or pegs pulled out.

If you cannot see it, use a simple tool. A cable or wire break detector, sold for robot mowers, follows the signal along the wire and goes quiet past the break. Many owners also use a portable AM radio held close to the wire, which on many systems picks up a buzz from the signal that stops at the break. Results vary by model, so treat it as a helpful hint rather than proof.

For long loops, a halving method helps. Unplug power, then connect a short temporary wire from the station across to a point halfway round the loop to make a smaller loop. If the signal returns, the break is in the half you bypassed. Repeat to narrow it down. Our [boundary wire installation guide](https://mowandedge.co.uk/blog/how-to-install-robot-mower-boundary-wire) covers wire layout and joins.

- A wire break detector designed for robot mowers
- A portable AM radio, as an extra clue
- Spare boundary wire and gel filled waterproof connectors
- Pegs, a small trowel and a lawn edging tool

## Repairing the wire and preventing repeats

Once you find the break, cut out any damaged section and join the ends with waterproof, gel filled connectors made for boundary wire. Twisting and taping wires lets in water and creates future faults. If the break is at a corner or where wire runs close to a hard edge, take the chance to reroute it slightly to the distances your manual gives.

To stop it happening again, peg the wire tight to the soil so it beds in, or bury it shallowly in vulnerable areas. Mark where it runs near beds before digging, and warn anyone using an edger or scarifier. If repeated breaks are making you consider a change, our [wire-free robot mower guide](https://mowandedge.co.uk/best/best-wire-free-robot-mower) covers models that do not use a loop wire.

## When to call a Husqvarna dealer

Call an authorised dealer if the station light suggests a fault even with the wire disconnected and replaced by a short test loop, if the message returns straight after a repair, or if the mower shows other faults such as a motor or sensor message. A dealer can test the station and mower circuit boards, update software and, where needed, lay or bury new wire.

If you are weighing up a newer model, our [Husqvarna Automower models compared](https://mowandedge.co.uk/best/husqvarna-automower-models-compared) guide sets out wired and wire-free options side by side.

[Compare Husqvarna Automower models](https://mowandedge.co.uk/best/husqvarna-automower-models-compared)

## Frequently asked questions

**Why does my Automower say no loop signal after a power cut?** The station may not have restarted, the socket may have tripped, or the system may need a moment to resume. Check power and the station light, then restart the mower. If it persists, follow the checks above.

**Can a mole or a strimmer cut the boundary wire?** Yes. Strimmers, edging tools, spades, scarifiers and burrowing animals are common causes of breaks, especially where the wire sits near the surface or close to an edge.

**Is there a Husqvarna loop wire break detector?** Wire break detectors for robot mowers are widely sold, and dealers use similar tools. Check that the one you buy suits boundary wire systems, and follow its instructions.

**Where do I find Husqvarna Automower error codes?** In the operator's manual for your exact model and on Husqvarna's support pages. The wording and any numbers vary by model and software version.

## Buying guides on this topic

- https://mowandedge.co.uk/best/husqvarna-automower-models-compared
- https://mowandedge.co.uk/best/best-wire-free-robot-mower
- https://mowandedge.co.uk/best/best-robot-lawn-mower

## Sources

- [Husqvarna UK](https://www.husqvarna.com/uk/)