KitchenAid Error Code 16-1: Sump Thermistor Replacement

The KitchenAid error code 16-1 signals a problem with the sump thermistor—the temperature sensor that monitors water temperature in the sump area at the bottom of the dishwasher tub.

Sump Thermistor Role

The sump thermistor provides real-time water temperature readings to the control board throughout wash cycles. This data regulates heating element operation, determines cycle timing, and ensures optimal wash temperatures. The 16-1 error appears when thermistor readings are out of range, the sensor circuit is open or shorted, or the thermistor has failed completely.

Testing and Replacement

• Step 1: Disconnect all power before beginning electrical testing. Turn off the circuit breaker to the dishwasher.
• Step 2: Remove the lower dish rack, spray arm, and filter assembly to access the sump area.
• Step 3: Locate the sump thermistor—a small sensor probe with two wires, mounted in or near the sump housing at the bottom center of the tub.
• Step 4: Disconnect the thermistor wiring connector. Test the sensor with a multimeter set to measure resistance (ohms).
• Step 5: At room temperature (approximately 68°F), the thermistor should read 45,000-55,000 ohms. Readings of zero (short) or infinity (open) indicate failure.
• Step 6: For thorough testing, measure resistance while warming the sensor (hold it or place in warm water). Resistance should decrease smoothly as temperature rises.
• Step 7: If the thermistor tests bad, order a replacement specific to your KitchenAid model. Remove the old sensor (usually pressed into a rubber grommet) and press the new one firmly into place.

Ensure the thermistor makes good thermal contact in its mounting location—proper positioning is critical for accurate readings. Route wiring carefully to avoid pinches, especially in areas that flex during door operation. After installation, restore power and run a test cycle with heating. The 16-1 error should clear once the control board receives valid temperature readings throughout the cycle. Temperature regulation is essential for effective cleaning and sanitizing.

In Summary: The most important thing about KitchenAid Error Code 16-1: Sump Thermistor Replacement is getting the basics right. Apply the tips above and you will avoid the most common pitfalls.

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