Bosch Dishwasher E11 Error: Thermistor Fault Diagnosis
Updated: February 2026
The Bosch E11 error code signals a thermistor (temperature sensor) malfunction. The control board has detected that temperature readings are implausible or the thermistor circuit has an electrical fault.
Thermistor Function
The thermistor is a temperature-dependent resistor that monitors water temperature throughout wash cycles. Its resistance decreases predictably as temperature rises. The control board continuously monitors this resistance to regulate heating and ensure proper wash temperatures. E11 appears when readings are out of range or the circuit is open or shorted.
Testing and Replacement
- Step 1: Disconnect all power before beginning any electrical testing. Safety is paramount when working with control components.
- Step 2: Remove the lower rack, spray arm, and filter assembly to access the sump area where the thermistor is located.
- Step 3: Locate the thermistor—a small sensor probe mounted in the sump near the heating element with two wire connections.
- Step 4: Disconnect the thermistor wires. Using a multimeter set to ohms, measure resistance across the thermistor terminals.
- Step 5: At room temperature (68-70°F), the thermistor should read 45,000-55,000 ohms. Readings of infinity (open circuit) or zero (short circuit) indicate failure.
- Step 6: For dynamic testing, submerge the thermistor in increasingly warm water while monitoring resistance. It should decrease smoothly without sudden jumps or drops.
- Step 7: Check wiring from the thermistor to the control board. Look for breaks, pinches (especially in the door hinge area), or corroded connections.
If the thermistor tests faulty, order a replacement sensor specific to your Bosch model. Installation involves pressing the new sensor into its rubber grommet in the sump. Ensure good thermal contact and route wiring carefully to avoid pinching. After replacement, run a test cycle with heating. E11 should clear once the control board receives valid temperature readings throughout the cycle.
In Summary: The most important thing about Bosch Dishwasher E11 Error: Thermistor Fault Diagnosis is getting the basics right. Apply the tips above and you will avoid the most common pitfalls.
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