Bosch Dishwasher Error Code FB

The FB code on a Bosch dishwasher indicates a spray arm divider fault. It means the position contact for the diverter mechanism is being read as continuously open or closed, suggesting the divider is not moving or not reporting its position correctly. This code only appears in the service menu and does not stop the dishwasher from completing its cycle. However, water distribution between spray arm levels may be affected.

Start by inspecting the spray arm divider assembly for physical obstructions such as debris jamming the mechanism. Then check the wiring and connectors leading to the diverter and its position contact for corrosion or damage. If the wiring is intact, the gearbox or position contact switch will likely need to be tested and potentially replaced. Because this requires access to internal components and service menu diagnostics, most homeowners will benefit from having a qualified technician perform the repair.

Repair costs vary depending on the root cause. If the issue is only wiring or a connector, costs may be relatively low, typically in the range of $75 to $150 for a service call and minor repair. If the spray arm divider gearbox or position contact switch needs replacement, parts and labor combined can range from $150 to $350 or more depending on your location and the specific model. Getting a diagnostic quote before authorizing parts replacement is recommended.

Yes, the FB fault is an indication-only code and the dishwasher programme will continue to run. However, the spray arm diverter may not be switching water between the upper and lower spray arms correctly, which could result in dishes on one rack level not being cleaned as thoroughly. It is advisable to have the fault diagnosed and repaired to restore full cleaning performance.

A reset may temporarily clear the FB code from the service menu, but it will return if the underlying fault in the spray arm divider, its position contact, or the wiring is not corrected. Because the FB code only appears in the service menu and does not halt the wash cycle, a reset alone is not a repair and should not be treated as a solution.