Dishwasher runs for an unusually long time; cycles extend far beyond the expected duration.

Safety first: Allow the dishwasher to cool and disconnect power before testing components.

• Check water temperature: Run hot water at the sink before starting the dishwasher. Ensure incoming water is at least 120°F (49°C).
• Test heater and NTC: Verify the heating element and temperature sensor are functioning as described in heating-related faults.
• Clean sensors and filters: Clean the filters and, if equipped, the turbidity/soil sensor in the sump to ensure accurate readings.
• Control calibration: If components test good, the main control board may be miscalculating cycle time and could require replacement.