How to eliminate E20 error in Bosch dishwasher?
- Error: E20
- Description: The E20 error code in a Bosch dishwasher indicates a problem with the motor resistance of the circulation pump.
- Cause: The most common cause of this error is a problem with the control board of the circulation pump motor. However, there may also be issues with the wiring of the element or with the drainage system being obstructed.
- Solution: The following steps are presented to solve the E20 error code in a Bosch dishwasher.
Step 1: Disconnect the appliance
Before starting any repairs, it is important to disconnect the dishwasher from the power source to ensure safety. This can be done by unplugging the appliance from the outlet or by turning off the corresponding switch in the electrical panel.
Step 2: Remove accumulated water
It is necessary to remove any water that has accumulated in the dishwasher’s circulation pump. To do this, follow these steps:
- Open the dishwasher door and remove all trays and baskets.
- Unscrew the drainage filter and rinse it thoroughly.
- Clean any obstructions in the drainage filter and make sure to clean it regularly to prevent future problems.
Step 3: Check the motor resistance of the circulation pump
To determine if the circulation pump motor is functioning correctly, its resistance must be checked using a multimeter. Follow these steps:
- Access the washing motor and check the resistance using a multimeter. Refer to our helpful guide “How to use a multimeter” for detailed instructions.
- If the motor resistance is outside the values specified by the manufacturer, it is likely that the circulation pump needs to be replaced.
Step 4: Replace the circulation pump
If it is determined that the circulation pump is the cause of the E20 error code, it will be necessary to replace it. Fortunately, a replacement circulation pump can be obtained from our wide range of spare parts for Bosch dishwashers.
E20 Error Code – Heat pump failure
Description: The E20 error code in a Bosch dishwasher can also indicate incorrect resistance values in the heat pump.
Action to take: To solve this error, the following steps must be followed:
- Check the cables and plugs of the dishwasher.
- Measure the resistance in the windings of the heat pump using a multimeter.
- In European and Australian models with a voltage of 240 V, the resistance should be approximately 41.5 ohms (+- 4 ohms).
- In American models with a voltage of 120 V, the resistance should be approximately 12.4 ohms (+- 1 ohm).
- If the resistance and wiring are within the specified values, it is likely that the E20 error code is caused by a defective main control board.
If the cause of the E20 error code cannot be determined or if you do not feel comfortable performing the repairs yourself, it is recommended to contact Bosch’s authorized technical service. They will be able to professionally diagnose the appliance and provide the necessary assistance.
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