===== First marker not found within 500 pulses =====

This is a [[troubleshooting:hard_alarms|hard]] alarm.

==== Description ====

No marker was detected when searching for the first marker during automatic cleaning, location creation or teach-in. The marker needs to be detected within about 1.2 meters from the starting position of the robot.

==== Troubleshooting ====

  * Check that the [[parts:comp_marker_switch|magnetic switch]] arm is in the correct position (both height and length)
  * Check that the marker is mounted properly
  * Check that the [[parts:comp_marker_switch|magnetic switch]] is working
  * Check that the robot was placed within 1 m from the first marker
  * Check that the distance from the [[parts:comp_marker_switch|magnetic switch]] to the marker is less than 10 cm