The mower can't read a valid boundary or guide loop signal, so it stops rather than risk leaving the lawn. On wire-guided models this almost always points to the charging station or the boundary wire.
Common causes
The charging station has lost power, or its signal light isn't showing the normal steady colour.
A break in the boundary or guide wire — very common after aeration, digging, frost heave, or a strimmer nick.
Corroded or loose wire connectors at the station or a splice joint.
A boundary loop that's too long, or interference from a nearby loop or buried cable.
How to fix it
Check the charging station is powered and its status light shows the normal 'good loop' colour for your model (see the manual).
Walk the boundary looking for cuts, kinks or exposed wire — a break is often where the grass looks disturbed.
Open and re-seat the boundary/guide connectors at the station; replace any that are corroded.
If the light shows a fault even with the wire disconnected, the problem is in the station; if it only faults with the wire connected, the break is in the loop.
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MowerWatch is an independent product, not affiliated with, endorsed by, or sponsored by Husqvarna AB. Automower® is a registered trademark of Husqvarna AB, used only to describe compatibility. Codes and guidance are provided in good faith — always follow your model's operator manual and consult a dealer for repairs. · All error codes · Guides