Replacing a Thermador switch selector knob is a relatively simple process. Here's a step-by-step guide to help you with the replacement: 1. Safety First: Before starting any repair work, ensure the appliance is disconnected from its power source to avoid electric shock. Turn off the circuit breaker or unplug the appliance. 2. Remove the Old Knob: Gently pull the old switch selector knob off the control panel. Some knobs may have a set screw on the side that needs to be loosened before removal. 3. Inspect the Shaft: Check the shaft on the control panel where the knob attaches. Ensure it is clean and free of any debris or residue. 4. Attach the New Knob: Slide the new switch selector knob onto the shaft and push it firmly into place. If the knob has a set screw, tighten it to secure the knob onto the shaft. 5. Test the Knob: Turn on the power and test the new knob to ensure it functions correctly and operates the intended switches. 6. Repeat for Other Knobs (if necessary): If you are replacing multiple knobs, repeat the process for each one. 7. Check for Alignment: Verify that all the knobs are aligned properly and sit flush with the control panel. 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 appliance operates smoothly with the new switch selector knob.