Replacing the control unit on a Thermador dishwasher DWHHD43CS/40 involves a systematic process. Here's a step-by-step guide to help you with the replacement: 1. Safety First: Before starting any repair work, disconnect the dishwasher from its power source to avoid electric shock. Turn off the circuit breaker or unplug the dishwasher. 2. Access the Control Unit: Remove the lower access panel at the front of the dishwasher to access the control unit. It is usually located near the bottom of the dishwasher, behind the access panel. 3. Disconnect the Wires: Carefully disconnect the wires attached to the old control unit. Take note of their locations or take a picture for reference. 4. Remove the Old Control Unit: Unscrew or unclip the old control unit from its mounting bracket or holder. 5. Install the New Control Unit: Align the new control unit with the mounting bracket or holder and secure it in place with screws or clips. 6. Connect the Wires: Reconnect the wires to the appropriate terminals on the new control unit based on your reference. 7. Replace the Access Panel: Put the lower access panel back in its place. 8. Test the Dishwasher: Turn on the power and test the dishwasher to ensure the new control unit is working correctly. Check that all functions and settings are operational. If you encounter difficulties during the process or are unsure about performing the replacement, it's best to seek assistance from a professional appliance repair technician. They have the expertise and tools to handle the replacement safely and effectively, ensuring your Thermador dishwasher DWHHD43CS/40 operates properly with the new control unit.