Joseph R Alamo , CA November 04, 2021 Appliance: Bosch Built-In Oven W/Microwave HBL8750UC/08 Bosch Wall Oven Hbl8750uc/08: Control board and sensor on Bosch wall oven failed. How to replace Relay. Found a local technician, that allowed me to order parts directly. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours