Wire Break/finding break in the loop wire.
The fault message No loop signal is displayed when the Automower® robotic lawn mower is not able to detect the loop signal from the boundary wire.
Possible causes:
- Actual break in the
wire
- Bad connection at the
charging station
- Damaged or water penetration at splice couplers
- No power or wrong voltage to the charge station
- Faulty charge station board
Diagnostic steps:
- Make sure power outlet
is working
- Make sure power is
connected correctly to charging station
- Confirm charging
station has Flashing Blue Light
- Take a short length of
wire and connect AL to AR connectors (see if light turns green)
This will confirm issue is with the wire and not the charge station - Check the resistance
of the perimeter loop with a multi meter (set to ohms/Omega symbol) just unplug
the perimeter/loop wire from the charge station, then take at reading at the 2
connection points/wire ends (AL and AR). It should read about 2 ohms per linear
100m (330ft).
- Check for bad
connection/corroded wires at charge station and any splice couplers.
- Walk the perimeter to
look for any obvious breaks or signs of damage to lawn
- You can purchase a Wire
Break Locator Kit to help find breaks:
Using Boundary and
Guide Wires to narrow down search: Follow below steps:
Note: This method does not work if ECO mode is activated. Make
sure first that ECO mode is off.
- Check that the indicator lamp in the charging station flashes blue,
which indicates a break in the boundary loop.
![](https://support.autmow.com/galleryDocuments/edbsnc0e6d657b2cd1ff035d125747f6ce71dffc1b6931929efc0c6ab91b536d1d8983449502f3fe073fbdbd58167b88f9d65?inline=true)
- Check that the boundary wire connections to the charging station are
properly connected and not damaged. Check that the indicator lamp in the charging
station is still flashing blue.
![](https://support.autmow.com/galleryDocuments/edbsnd82fa83c916b3cbc990c4d8a1287157a9705a14b129821200a001afaa6bca4a7d04a5e0c35ae215389d13e7d619c5a12?inline=true)
- Switch the connections between the guide wire and the boundary wire in the charging station.
Start by switching connection and…
If the indicator lamp has a solid green light, then the break is somewhere on the boundary wire between and the point where the guide wire is connected to the boundary wire (thick black line in the below illustration).
![](https://support.autmow.com/galleryDocuments/edbsnd82fa83c916b3cbc990c4d8a1287157ab5907a03c92375bf4859e13222a465658adc6ac8eaac3b92ef4c8426429ba0c5?inline=true)
To
rectify the fault you will need boundary wire, connector(s) and coupler(s):
a) If the suspected boundary wire is short then it is easiest to exchange all
of the boundary wire between and the point where the guide wire is connected to
the boundary wire (thick black line).
b) If the suspected boundary wire is long (thick black line) then do as
follows: Put and back to their original positions. Then disconnect. Connect a
new loop wire to it. Connect the other end of this new loop wire at the middle
of the suspected wire section.
![](https://support.autmow.com/galleryDocuments/edbsn5e6a5001d1304210fae6c168fb37954c50df6a635398484210708ca0604e4895d67bf87227ca9ba0f7ff2e56ea494a65?inline=true)
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.
![](https://support.autmow.com/galleryDocuments/edbsn7b63345b7ce34df4c76b90acc10870bc4121eec2c5fa2656585ee08f951dc1e005ca955f46f60d5df228759e1721742e?inline=true)
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 instructions
in step 5 below. - 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.
- When the break is found, the damaged section must be replaced with a new wire. Always use original couplers.
![](https://support.autmow.com/galleryDocuments/edbsn31f2cc0374d26dd6da6202df1362f61328257965b07137b23b5f16f731beedd6a75e36d39d1aefca4284f16ba44ae386?inline=true)
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