This fault display means the Level Sensor is indicating a full vessel when the vessel is actually empty. The Level Sensor has three parts:

  1. Glass Tip (visible inside the vessel)
  2. SICK Module (blue, found inside the electrical cabinet)
  3. Fiber Optic Cable that connects the glass tip to the SICK Module.

Possible Causes:

The glass tip needs to be cleaned. Open the vessel, remove the white Teflon bag holder, and locate the glass tip. Clean the tip with alcohol.

The SICK Module is not working correctly. Open the electrical cabinet and locate the SICK Module. It is blue and mounted to the back wall. If the vessel is empty, the white button on the SICK Module should be lit. If it is not lit, press and hold the white button until the button lights up. This will retrain the Sensor.