Bosch Dishwasher Error Code F87

F87 indicates a fault in the sensor softener system, specifically a communication or power failure at the 10N1 electronic sensor module. The sensor is responsible for monitoring water softening and triggering salt regeneration at the correct points. When it fails, the dishwasher switches to an emergency mode that uses fixed default timing instead of live sensor data. The appliance will continue to run but the water softening system will not operate at full accuracy.

The dishwasher is designed to continue operating in emergency mode when F87 is active, so it is not immediately unsafe to run. However, the default softener timing may not match your actual water hardness, which can lead to scale buildup on the heating element and spray arms over time. It is best to resolve the fault promptly rather than relying on the emergency program for extended periods.

A reset may temporarily clear the F87 code from the display, but the fault will return if the underlying problem with the sensor softener module or its wiring has not been fixed. Resetting does not repair a failed component or restore a broken connection. To permanently clear the code, the root cause identified through diagnostic checks must be corrected first.

Some causes of F87 can be addressed by a knowledgeable DIYer. Checking the wiring harness for visible damage, inspecting connectors for corrosion, and verifying the 9 VAC supply to the sensor module are all reasonable self-service steps. However, if the sensor module or control board needs to be replaced, that work requires comfort with appliance electronics and proper part sourcing. If you are unsure about working with live voltage, contact a qualified technician.

If the issue is limited to a loose connector or damaged wire, repair costs may be minimal, primarily covering a technician's diagnostic time. Replacing the 10N1 sensor softener module typically ranges from around $80 to $200 depending on the specific model and parts availability. If the main control board is at fault, costs can range from $150 to $400 or more including parts and labor. Getting a diagnostic quote before committing to a repair is recommended.