Thermistor/OWI Failed Calibration — OWI sensor or drain hose check valve issue

What does Thermistor/OWI Failed Calibration mean?

The Optical Water Intelligence (OWI) sensor has failed calibration, or the drain hose check valve is not sealing properly, allowing dirty water to backflow.

• OWI sensor failure or dirty lens
• Drain hose check valve not sealing
• Loose or faulty connections in the soil sensing circuit

Click steps to track your progress.

1. 1

   Run the Service Diagnostics to check OWI operation. It should detect low soil in clear water.

2. 2

   Clean the OWI lens surface if it appears dirty.

3. 3

   Disconnect the drain hose at the plumbing connection.

4. 4

   Elevate the hose above the dishwasher and fill it with water. If water flows back into the dishwasher, the drain loop needs replacement.

5. 5

   Unplug dishwasher or disconnect power and check connections in the soil sensing circuit.

6. 6

   After replacing the OWI sensor, run Diagnostics to force calibration on the next wash cycle.