Knob, blk (cvs) The Control Knob is an OEM part for Bosch ranges and cooktops. As the interface regulating gas flow, control knobs activate precise burner levels through internal calibration. Causes of failure include loosened set screws beneath allowing knob slippage. Prolonged heat and moisture exposure may also degrade contact surfaces over time. Symptoms of faulty knobs include: Burners failing to engage or not matching dial settings Inability to decrease output levels from full flame Knobs wobbling insecurely or detaching entirely This genuine OEM Bosch part is also compatible with Thermador, Gaggenau and select Kenmore models.00414821 (AP2832330) replaces 1014213, 19-12-134-01, 414821, AH3460303, EA3460303, PS3460303, PS8710619.