If a dishwasher keeps running continuously without completing its cycle or without shutting off, there could be several possible reasons for this issue. Here are a few common ones:
Stuck or Faulty Timer: The timer or control board that regulates the dishwasher's operations may be faulty or stuck. If it gets stuck in a particular cycle or fails to advance, the dishwasher can keep running indefinitely. In such cases, professional repair or replacement of the faulty component may be necessary.
Malfunctioning Water Inlet Valve: The water inlet valve controls the flow of water into the dishwasher. If it fails to close properly, the dishwasher may continuously fill with water, causing it to run endlessly. A defective or stuck water inlet valve may require replacement.
Clogged or Faulty Float Switch: The float switch is a component that detects the water level inside the dishwasher. If it becomes stuck due to debris or malfunctions, it can prevent the dishwasher from recognizing that the proper water level has been reached, causing it to continue running. Cleaning or replacing the float switch may be required.
Sensor or Thermostat Issues: Dishwashers often have sensors and thermostats that monitor various aspects of the cycle, such as water temperature or pressure. If these sensors malfunction or provide inaccurate readings, it can disrupt the cycle and lead to the dishwasher running indefinitely. Professional diagnosis and repair may be necessary.
Clogged or Faulty Drain Pump: A clogged or malfunctioning drain pump can prevent the dishwasher from effectively draining the water. If the dishwasher does not detect that it has drained completely, it may continue running. Clearing the drain pump of any debris or replacing a faulty pump may be required.
If your dishwasher is experiencing this issue, it is generally recommended to consult the dishwasher's user manual for troubleshooting steps specific to your model. If the problem persists, it is advisable to contact a professional appliance repair technician to diagnose and fix the underlying cause.