husqvarna · Automower Technical Manual
The green LED on the charging station is flashing twice every other second, indicating a weak boundary loop signal. This may be due to the wire being too long or damaged.
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Consider installing a Signal amplifier (522 42 58-01), available as an accessory, if the loop is longer than 500 meters (up to 800 meters).
Check the boundary wire for any damage or breaks that might be causing signal weakening.
If possible, reduce the overall length of the boundary wire to improve signal strength.
Ensure all boundary wire connections are secure and free from corrosion.