Husqvarna AUTOMOWER 420 Operator's Manual page 58

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If the indicator lamp now is green, then the
break is somewhere in the wire between the
disconnected end to the point where the
new wire is connected (thick black line
below). In that case, move the connection
for the new wire closer to the disconnected
end (roughly at the middle of the suspected
wire section) and check again if the indicator
lamp is green.
58 - Troubleshooting
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 - 004 - 25.03.2020