Dacor Range, Oven, Cooktop Error Code FB

The FB code on a Dacor Third Generation dishwasher signals a spray arm diverter fault. The control has detected that the position switch monitoring the diverter is either always closed or always open, meaning it cannot confirm the diverter is moving correctly. Indicators L1 and L6 will flash when this fault is active. The diverter gearbox, position switches, and connecting cables should all be inspected as part of diagnosis.

Operating the dishwasher with an active FB code is not recommended. The diverter fault means water may not be distributed correctly to both spray arms, which will result in poor wash performance and dishes that are not properly cleaned or sanitized. Continuing to run the machine without resolving the fault could also place extra strain on the wash pump and motor.

A power reset may temporarily clear the FB code from the display, but it will return as soon as the dishwasher runs and the control re-checks the diverter position switch. The underlying fault in the gearbox, switch, or wiring must be diagnosed and corrected for the code to stay cleared. Resetting without repair is not a lasting solution.

Start by inspecting the spray arm diverter assembly for physical damage or binding in the gearbox. Test the position switches for proper continuity as the diverter shifts between positions, and check all wiring and connectors for corrosion or loose terminals. If a specific component, such as a stuck switch or failed gearbox, is identified, replacing that part should clear the fault. If wiring and mechanical components all check out, the control board may need evaluation.

Repair costs vary depending on which component has failed. If the fix is limited to reseating a connector or replacing a position switch, costs are typically in the lower range, roughly $50 to $150 including parts. A diverter gearbox replacement or control board repair can bring the total to $150 to $400 or more, depending on parts pricing and labor rates in your area.