If your Bosch dishwasher is continuously draining and won't stop, there could be several possible reasons for this issue. Here are some common causes to check:
Clogged or Blocked Drain: The most common reason for continuous draining is a clogged or blocked drain. Check the dishwasher's drain filter, drain pump, and the drain hose for any debris, food particles, or foreign objects that might be obstructing the flow. Clean out any blockages you find.
Float Switch Issue: The dishwasher's float switch is a safety feature that detects water levels in the appliance. If the float switch is stuck in the "up" position, the dishwasher will think it has water in it, causing it to continue draining. Inspect the float assembly for any obstructions or malfunctions.
Faulty Drain Pump: A malfunctioning drain pump can also cause continuous draining. If the drain pump is not working correctly, it may continuously try to drain water even when there is none. Test the drain pump to see if it's functioning properly, and if necessary, replace it.
Water Inlet Valve Problem: If the water inlet valve is faulty or stuck open, water may continuously flow into the dishwasher and then drain out immediately, causing the constant draining issue. Inspect and test the water inlet valve to determine if it's the source of the problem.
Circuit Board or Control Panel Malfunction: In some cases, a malfunction in the dishwasher's circuit board or control panel can cause unusual behavior, including continuous draining. Inspect these components for any signs of damage or malfunction.
Sensor Malfunction: Dishwashers have sensors that detect water levels and monitor various functions. If one of these sensors is malfunctioning or giving false readings, it can lead to improper drainage. Check the sensors for any issues.
Drain Hose Placement: Ensure that the drain hose is correctly installed and looped above the level of the sink's drain. If the hose is placed too low, it might cause continuous draining due to siphoning.
If you are not comfortable diagnosing or repairing the dishwasher yourself, it's best to contact a professional appliance repair technician or the manufacturer's customer support for assistance. They can properly diagnose the problem and provide the necessary repairs or replacements to resolve the issue.