Precor Error Code OBS Obstruction Sensor

Mar 19, 2022

Applies to SCL800

Issue Symptoms

The Obstruction error alerts the user that something is blocking the OBS sensors. When detected, the machine immediately slows to a stop and the "OBS Obstruction Detected" message is displayed. Typically an object is blocking the IR beam between the emitter and receiver OBS sensors. Other causes could include dirty sensor IR lens or a faulty damaged sensor component.

The OBS error is not logged in the Error Log. An "OBS Obstruction Detected" message is immediately displayed and remains until the fault condition is remedied.

Troubleshooting steps

1. Check for and clear any item(s) that is blocking the IR beam between the obstruction emitter and receiver sensors.

2. If the obstruction sensors are working, then both the emitter (left side) and receiver (right side) will each show a red LED. When blocked, the OBS receiver LED will be OFF and the emitter LED will remain ON (red).

3. If the OBS emitter LED is ON (red), but the receiver LED is OFF, then suspect the receiver is unplugged or has a cable issue.

4. If no cable issue is found, then the receiver needs to be replaced. If the OBS emitter LED is OFF, the receiver LED will also be OFF. First suspect is that the emitter is unplugged or the cable is damaged. If no cable issues, measure the voltage on the connector at the LPCA OBS Emitter (J4) connector. The voltage should read 24 volts DC. If no voltage, unplug both the emitter and receiver, wait a few minutes and test again. The sensors are protected with a thermal fuse so a cable or sensor short would trip the fuse. Once the short is repaired, the fuse may take a few minutes to cool down before power will switch back ON. If still no 24 volts, the LPCA will need to be replaced.