Encountering an E6 error on your Whirlpool dishwasher can be puzzling, but don’t worry, it’s a common issue we can diagnose together. This specific error code, E6, signals an “NTC Open Circuit Failure.” In simpler terms, your dishwasher’s temperature sensor (the NTC thermistor) isn’t completing its electrical circuit, meaning the appliance can’t accurately read or regulate water temperature.
What Triggers This Error?
- The NTC temperature sensor itself has failed, creating an open circuit within the component.
- Damaged or loose wiring connecting the NTC sensor to the main control board, preventing a proper electrical signal.
- A faulty main control board that is unable to correctly interpret signals from the NTC sensor or has a defective input circuit.
- Extremes in inlet water temperature that, while not directly causing an open circuit, can sometimes stress components or indicate underlying issues that might lead to sensor failure.
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Your Step-by-Step Resolution Guide
Addressing an E6 error requires a methodical approach. Follow these steps carefully to pinpoint and resolve the issue:
- Safety First: Disconnect Power. Before performing any inspection or repair, always unplug your Whirlpool dishwasher from the power outlet or switch off its dedicated circuit breaker to prevent electric shock.
- Locate the NTC Sensor. The NTC (Negative Temperature Coefficient) sensor, often referred to as a thermistor, is typically situated near the heating element in the sump area at the bottom of the dishwasher tub. You may need to remove the lower spray arm and filter assembly to gain access.
- Inspect Wiring and Connections. Carefully examine the wires leading to the NTC sensor for any signs of damage, cuts, fraying, or corrosion. Ensure all connectors are securely attached to both the sensor and, if visible, the control board. A loose connection can mimic an open circuit.
- Test the NTC Sensor. Using a multimeter, set it to the ohms (Ω) setting. Disconnect the sensor from its wiring harness and place the multimeter probes on the two terminals of the NTC sensor. A healthy sensor will display a resistance value (which varies with temperature). If your multimeter shows “OL” (over limit) or an infinite reading, this confirms an open circuit within the sensor, indicating it needs replacement. You can also test your inlet water temperature with a thermometer to ensure it’s within the normal operating range, though this is primarily for diagnostic purposes once the sensor circuit is confirmed.
- Consider Main Control Board. If the NTC sensor tests good and all wiring appears intact and secure, the issue might lie with the main control board. The board may not be correctly reading the sensor’s input or could have an internal fault. This is typically a last resort after ruling out the sensor and wiring.
- Replace Faulty Components. If your tests indicate a failed NTC sensor, replace it with a new, compatible part. If you suspect the main control board, proceed with its replacement.
- Reassemble and Test. Once the faulty component is replaced, carefully reassemble your dishwasher, ensuring all connections are secure. Restore power and run a short wash cycle to verify the E6 error has been resolved.
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