Bosch Dishwasher Error Code 16

Error code 16 on a Bosch dishwasher indicates a water switch fault. The control board monitors the water switch (also called the pressure switch or flow switch) to verify that water is present and at the correct level during the fill and wash cycles. When the signal from the water switch is absent, inconsistent, or outside expected parameters, the control board logs error 16 and halts the cycle to prevent dry operation or overflow damage.

For homeowners, the water switch is a small sensor inside the dishwasher that tells the machine whether water has entered the tub. When this sensor malfunctions or loses communication with the control board, the dishwasher cannot confirm that filling happened correctly, so it stops and displays this code. The issue may be in the switch itself, in the wiring connecting it to the control board, or in a blockage affecting the switch's ability to read water pressure.

Because the water switch is a safety-critical component, the dishwasher will not resume normal operation until the fault is resolved. The problem can sometimes be intermittent, appearing only under certain fill conditions or temperatures.