Husqvarna AUTOMOWER 420 Operator's Manual page 49

Continue until only a very short section of the wire
remains which is the difference between a solid
green light and a flashing blue light. Then follow
instruction in step 5 below.
4. If indicator lamp still flashes blue in step 3
above: Put and back in their original positions.
Then switch and . If indicator lamp now is lit with
a solid green light then disconnect and connect a
new boundary wire to . Connect the other end of
this new wire at the middle of the suspected wire
section. Follow the same approach as in 3a) and
3b) above.
5. When the break is found, the damaged section
must be replaced with a new wire. Always use
original couplers.
1201 - 007 - 20.02.2023 Troubleshooting - 49