husqvarna · Automower Technical Manual
This indicates a problem with the front loop sensor, which can be due to damaged cabling, a loose connection, or a defective sensor card itself. It affects the mower's ability to detect the boundary wire at the front.
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Check the levels for Af and Ar via Quick check (Press and hold '0' for 2 seconds) and switch with YES button.
If Af is 0 and Ar is higher than 70 (when mower is outside charging plate, but inside loop) or Quality is lower than 100%, inspect the cabling to the front loop sensor for damage or looseness.
Ensure all connections to the front loop sensor are secure and undamaged.
If cabling is undamaged and the values still indicate a defect, the front loop sensor card may need replacement.
Contact service if you suspect a defective sensor card.