E2 error on a Bosch dishwasher: A troubleshooting guide (2024)

If your Bosch dishwasher is displaying an E2 error code, it usually indicates a problem with the NTC (temperature) sensor. You’ll most likely need to fix the faulty NTC sensor or related wiring.

If you find out that you need any replacement parts for your Bosch dishwasher while you’re troubleshooting, you can enter your model number at AppliancePartsPros.com to order them. Most orders arrive in just two business days, and we have thousands of free guides to show you how to install your new parts.

Disclaimer: The error code information in this article is based on general service manuals and may not apply to your specific appliance model. While we strive to offer helpful advice for DIY appliance repairs, variations in models and configurations can lead to differences in troubleshooting steps, error codes and part replacements. For the most accurate guidance, we strongly recommend consulting the technical sheet for your specific appliance model.

What does the E2 error code mean?

The E2 code specifically indicates that the control module has detected an issue with the NTC (“negative temperature coefficient”) sensor’s output. The NTC sensor monitors the temperature of the water during the dishwasher’s wash and rinse cycles. Depending on the model, it’s on or near the heating element and detects resistance changes as the water heats up. The resistance decreases as the temperature rises.

If the control module isn’t receiving the expected resistance values from the sensor, it will trigger the E2 error. This could mean:

• The NTC sensor has failed
• There’s a wiring problem between the NTC and the control module
• The control module’s input circuitry has malfunctioned

Read more: How Does a Dishwasher Work?

Safety precautions

When working on any appliance, remember to keep safety first. Here are some tips to keep in mind:

• Always power off and unplug your appliance or switch off the circuit breaker before you attempt any maintenance or replacement work. This keeps you safe by eliminating any risk of electric shock.
• If the appliance has recently been used, give it plenty of time to cool down before working on it.
• Turn off the water supply at the outlet before beginning repairs. Keep towels ready to catch any residual water in the system when removing parts.
• Take your time while working to prevent accidents and personal injuries. Rushing is the enemy of precision.
• Work in a well-lit area so you can see and access appliance parts.
• Keep your workspace free of clutter and other obstacles. Keep children and pets away from the work area.
• Never work on internal parts with wet hands. Make sure the work area is completely dry.
• Check the user manual to see if there are specific installation or safety instructions related to your appliance or replacement part.
• Be gentle when handling or removing parts. Excessive force might damage the appliance or cause personal injury.
• Wear insulated work gloves to protect your hands from sharp metal parts and debris.
• When working with wires, avoid touching any exposed wires or terminals. If you need to touch a wire, use a non-conductive tool or wear insulating gloves to prevent electrical shock.
• Always take photos or make a note of wiring terminals or other connections before disconnecting them to make reassembly easier.
• Don’t test live voltage with a multimeter if you’re unfamiliar with how to prevent short-circuiting.

Read more: Reduce Water Usage In Your Dishwasher

How to troubleshoot the E2 error

Follow these steps to find out what’s causing the E2 error on your Bosch dishwasher so you can resolve it yourself.

Step 1: Find and remove the NTC sensor

The NTC sensor is mounted directly on the metal heating element housing. To access it:

1. Unplug the dishwasher from the power outlet & shut off the water supply.
2. Remove the outer door panel and side access panel.
3. Find the heating element assembly mounted to the plastic tub near the bottom.
4. Find the round NTC sensor attached to the element housing. It will have two wire leads.
5. Use needle-nose pliers to gently detach the wire connectors from the NTC sensor prongs.

Step 2: Test the NTC

1. Set a multimeter to resistance moded, usually indicated by the Greek symbol omega (Ω).
2. Touch the meter probes to the two NTC wire terminals.
3. Check the meter reading. The resistance should fall within the acceptable range shown in the temperature/resistance chart provided in the service manual for your specific Bosch dishwasher model. Resistance values should typically be around 55K Ohms at room temperature.

If you get a reading that’s out 0, infinite or out of the acceptable resistance range, then the NTC is faulty and needs to be replaced.

If the NTC is good, we can continue troubleshooting.

Step 3: Check the sensor wiring

1. Remove and reinstall the wire connectors. Make sure they’re secure.
2. Check for any damaged wiring and replace it as needed.
3. Look for any damaged wiring insulation. If you find any that’s burned or cut, replace it.
4. Set a multimeter to continuity mode.
5. Use the meter probes to check for continuity from end to end through the circuit. The meter should make an audible beep if there’s continuity.

If there’s no continuity, replace the wiring. If there is continuity, move on to the next step.

Step 4: Retest at the control module

1. Check the service schematic to determine which pins correspond to the NTC input on your model.
2. At the module, find the NTC sensor input pins. Detach the two wires that connect to those pins.
3. Set the multimeter to resistance mode (Ω).
4. Use your multimeter probes to measure the resistance directly at the control module.
5. Check the meter reading. If the resistance no longer matches what’s on the NTC chart, then the control module’s input circuit could be the problem.

If the NTC sensor and wiring are good at this point, replace the control module as a last resort. On some dishwasher models, the NTC sensor is integrated into the control module circuit board. In that case, the entire control module would need to be replaced to correct the E2 error.

Read more: Dishwasher is Leaking Water: Top 6 Reasons and Fixes

Additional information

Thank you for reading! We hope this guide helped you get your Bosh dishwasher working again.

If you have any other appliance repair needs or projects, don’t hesitate to explore our other troubleshooting guides and videos.

If you need replacement parts or some extra help with ordering them, grab your model number and head over to AppliancePartsPros.com, where you can chat with a pro, read our DIY blog and more.

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