10 Reasons Why Your Bosch Dishwasher Won’t Start

Authorized Service
December 11, 2023
Dishwasher Repair

Bosch dishwashers are renowned for their superior quality, reliability, and user-friendly design. Many owners enjoy years of trouble-free operation, but occasionally, issues may arise that prevent the dishwasher from starting. In this article, we’ll explore the most common reasons why your Bosch dishwasher might not begin its cleaning cycle and walk you through the steps to resolve these issues.

This guide applies to most Bosch dishwashers, including these models: 
















1. Power supply problem

One of the most basic yet often overlooked reasons for a Bosch dishwasher not starting is a power supply problem.

Solution:  Ensure the dishwasher is securely plugged in and there hasn’t been a circuit breaker trip. If the circuit breaker has been tripped, reset it. If you discover a damaged power cord or blown fuse, replace it.

2. Damaged door latch

The dishwasher’s door latch ensures that the door remains securely closed during a wash cycle. The dishwasher cannot initiate the cycle if the door fails to latch properly.

A damaged door latch may have cracks, broken parts, or be misaligned. Not hearing a click when closing the door may also indicate a defective door latch.

Solution: Check that the door closes properly and inspect the door latch for any damage. Replace the latch if necessary.

3. Faulty door switch

Not to be confused with the door latch, the door switch is responsible for turning off the dishwasher when the door is open. A malfunctioning door switch can prevent the dishwasher from starting, even when the door is shut correctly.

Solution: If you’re comfortable using a multimeter, follow these steps to test the door switch:

  1. Turn off the power.
  2. Locate the door switch in the console on the top of the door and use a multimeter to check for continuity.
  3. If the switch has continuity, it’s functional. If not, replace it.

4. Water supply issue

A Bosch dishwasher requires a reliable water supply to function correctly. Ensure that it’s properly connected by following these steps:

  1. Check all water hoses, connections, and switches to confirm they are correctly turned on and securely attached.
  2. Replace any faulty water hoses, connections, or switches.

5. Drainage problem

A Bosch dishwasher will not start if it detects excessive water in the base pan, indicating a potential leak or clog in the drain system.

Solution: Check for clogs in the drain hose and the air gap if your dishwasher has one. Look for any visible leaks or damage. Clear clogs and repair leaks as necessary.

6. Blown thermal fuse

The dishwasher’s thermal fuse is a safety feature to prevent overheating and potential fire hazards. When this fuse becomes faulty or blows, it cuts off power to the dishwasher, preventing it from starting again.

Solution: To test the thermal fuse, follow these steps:

  1. Turn off the power.
  2. Locate the thermal fuse, typically found inside the door console.
  3. Use a multimeter to test the thermal fuse for continuity. Replace it if there’s no continuity.

7. Malfunctioning touchpad or control panel

An issue with the dishwasher’s touchpad or control panel can also cause the dishwasher not to start.

Solution: To test this component, perform these steps:

  1. Ensure the power is on.
  2. Press each button and check for proper responses. If any buttons don’t work, try cleaning the control board’s ribbon connector (see instructions below) or replace the touchpad.
  3. If all buttons work correctly, resetting the control panel by unplugging the dishwasher from the wall for one minute and then turning it back on may fix the issue.

8. Dirty ribbon connector

If any buttons on the dishwasher’s touchpad are not responding, the touchpad’s control panel may have a dirty ribbon connector. However, cleaning the ribbon connector requires caution and gentle handling to avoid damage. If you are uncomfortable or need clarification about performing this task, it’s advisable to seek professional assistance to ensure everything runs smoothly.

Solution: Use a cotton swab or a soft, lint-free cloth slightly dampened with isopropyl alcohol to gently clean both sides of the ribbon connector. Follow these steps:

  1. Disconnect the power to the dishwasher.
  2. Refer to your dishwasher’s user manual for specific instructions on accessing your model’s control panel.
  3. Remove the control panel cover and locate the ribbon connector.
  4. Disconnect and remove the ribbon connector. Be extremely careful not to damage or tear the ribbon cable.
  5. Wipe away any dust, dirt, or residue that may have accumulated on the contacts. Ensure the connector is dry before reassembly.

9. Faulty motor or pump

The dishwasher’s motor and pump are critical components for its operation. If they malfunction, the dishwasher won’t be able to pump water in and out effectively.

Solution: Consult a professional technician to inspect and repair or replace the motor or pump. Attempting to fix these components yourself can be challenging and may void your warranty.

10. Main control board issues

The main control board directs power to various dishwasher components. If it malfunctions, it can prevent your Bosch dishwasher from starting or running smoothly. However, testing the main control board is a complex process, and it should be considered only after thoroughly examining other components.

Solution: Consult a qualified technician for main control board inspection and potential replacement after ruling out other issues.

Final thoughts

While some issues can be resolved through simple DIY steps, others may require professional attention, particularly when dealing with complex components like the motor, pump, and main control board. It’s essential to exercise caution and follow manufacturer guidelines when attempting any repairs. If you encounter challenges or remain unsure about the resolution, don’t hesitate to seek expert assistance to ensure your Bosch dishwasher runs efficiently and reliably once more.


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