No loop signal — Boundary wire broken or charging station power issue

What does No loop signal mean?

This fault message means the mower isn't detecting the signal from the boundary wire. This can be caused by a break in the wire, a power issue with the charging station, or problems with internal components.

• Break in the boundary wire.
• No voltage to the charging station or its transformer is disconnected/tripped.
• Communication breakdown between Automower and charging station.
• Boundary wire routed incorrectly around an island.
• Defective circuit card in the charging station, front loop sensor card, or mower's control box.
• Interference from metallic objects or buried cables.

Click steps to track your progress.

1. 1

   Check the LED on the charging station. If it's flashing once per second, repair the boundary wire using a water-tight connector.

2. 2

   Verify the transformer is connected to the mains supply and check if its miniature circuit-breaker has tripped. Reset by unplugging, waiting 10 seconds, then reconnecting.

3. 3

   Place the Automower in the charging station and re-enter the PIN code via Settings - Security - PIN code (4-1-1).

4. 4

   Check the boundary wire routing, especially around islands, to ensure it follows installation instructions.

5. 5

   Use Quick check (hold '0' for 2 seconds) to verify Af and Ar levels. If both are 0 or Quality is below 100%, the circuit card or control box may be defective and need replacement.