Husqvarna Automower No Loop Signal Error (Boundary Wire)
- Charging station lost power or a cut low-voltage cable
- Loose or corroded boundary or guide wire at the terminals
- A break in the boundary wire from an edger, frost, or an animal
Problem Description
The Automower stops with a No Loop Signal message and will not mow, meaning it cannot detect the boundary-wire signal from the charging station. This is a wire, connection, or interference problem on wire-based Automowers, and a methodical check finds it. EPOS satellite models do not use a loop and will not show this.
Why This Happens in Real Homes
No Loop Signal means the mower cannot detect the boundary-wire signal from the station, which on wire-based Automowers is a wire, connection, or interference problem. In real installs the top causes are a station that quietly lost power and a wire cut by an edger or frost heave.
Check station power first, reseat the terminals, and use a resistance test to find a break before suspecting the mower. EPOS satellite models do not use a loop at all, so this does not apply to them.
Symptoms
- No Loop Signal message and it will not mow
- Charging station light is off
- Mower will not leave the station
- Fault appeared after edging or landscaping work
- Signal drops in and out
- Fault after extending the boundary
- No Loop Signal shown while parked in ECO mode
- Ran fine before a storm or a frost
Recognize these? Here's what usually causes it.
Common Causes
- Charging station lost power or a cut low-voltage cable
- Loose or corroded boundary or guide wire at the terminals
- A break in the boundary wire from an edger, frost, or an animal
- Boundary loop over the roughly 800m length limit
- Metal fences or buried cables distorting the signal
- ECO mode disabling the loop signal while idle
- A poor splice from an earlier repair
- Faulty charging station board
Most fixes happen in the first 3 steps.
Switch off the mower before handling the charging station wiring. Use only proper waterproof connectors on the boundary wire; taped splices corrode and fail.
Step-by-Step Solution
Check the charging station power and light
Look at the charging station indicator light. If it is off, the station has no power or no loop signal, so confirm the transformer is plugged into a working outlet and the low-voltage cable runs unbroken to the station. A surprising number of No Loop Signal faults start with a station that simply lost power at the outlet or a chewed low-voltage cable, not the boundary wire at all.
Reseat the boundary and guide wire connections
At the charging station, check that the boundary wire ends and the guide wire are fully inserted into their terminals with clean, tight contacts. A wire end that has worked loose or corroded over a season is a very common cause of the signal dropping. Re-strip and reconnect any end that looks oxidized or is barely seated, so bright copper meets the terminal.
Find a break in the boundary wire
A wire cut by an edger, frost heave, or an animal breaks the loop and kills the signal. With the station showing the fault, disconnect the boundary wire and measure resistance across the two ends with a multimeter: a healthy loop reads a low resistance, while an open circuit reads infinite, which confirms a break to hunt down and splice with a proper waterproof connector rather than a twist of tape.
Respect the maximum wire length
The total boundary loop has to stay within the limit for your model, up to roughly 800 metres or 2,625 feet, or the signal gets too weak for the mower to read and it reports No Loop Signal. If you recently extended the boundary or added a large area, you may have pushed past that limit, so shorten the loop or rebalance the layout back within spec.
Move metal and buried cables away from the wire
Metal fences, reinforcing steel, and buried power or irrigation cables near the charging station or running parallel to the boundary wire distort the loop signal. Relocate the station away from large metal objects, and reroute the boundary so it crosses buried cables and fences at an angle rather than running alongside them, which is where interference builds up.
Rule out ECO mode, then escalate
On models with ECO mode, the loop signal is switched off when the mower is not scheduled to mow, so a No Loop Signal shown while it is parked and idle can be normal. Place the mower in the station and start it from there to wake the signal. If the station has power, the wires are sound, the length is within limit, and it still shows No Loop Signal, contact Husqvarna Automower support at 1-833-991-7626.
Quick Solutions
Still having issues? This is usually the deeper cause below.
If this comes back after following these steps, check whether a recent app or firmware update reset a default setting — the fix works, but the setting gets reverted silently.
Husqvarna has step-by-step wire-break and No Loop Signal articles in the Automower support center. Keep a waterproof wire connector and a spare length of boundary wire on hand, since edger and frost damage to the loop is the most common Automower service call.
Battery-related failures are almost always flagged too late — the device degrades silently for days before the app catches up to what's actually happening.
- Charging station lost power or a cut low-voltage cable
- Loose or corroded boundary or guide wire at the
- A break in the boundary wire from an edger,
- Boundary loop over the roughly 800m length limit
- Metal fences or buried cables distorting the signal
Before you go — try one of these (they fix most cases).
Official Manufacturer Manual
Husqvarna provides official product documentation through their online manual rather than downloadable PDF. Access setup guides, troubleshooting steps, and product specifications for your Husqvarna Automower Robotic Lawn Mower.
Source: husqvarna.com
Need More Help? Husqvarna Support
Note: The contact information below connects you directly to Husqvarna's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.
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