Whirlpool Dishwasher Error Code 12-5

Error code 12-5 on a Whirlpool dishwasher indicates a problem with Antenna B, specifically a loose or faulty connection in the external antenna circuit. The control board has detected that the antenna signal is degraded or absent. This is typically caused by a loose connector, corroded terminals, or a failed antenna component. Resolving the issue requires inspecting and repairing the antenna circuit after disconnecting power.

The 12-5 code points to an antenna circuit fault, which is a communication or control system issue rather than a direct hazard like a water leak or overheating component. However, running the appliance while an active fault code is present is not recommended, as other functions may be affected. It is best to resolve the fault before returning the dishwasher to regular use.

If the issue is simply a loose connector, the repair may cost nothing beyond the time to access and reseat it. If the external antenna component itself needs replacement, parts costs can range from roughly $20 to $80 depending on the specific model, plus labor if a technician is involved. Professional diagnostic and repair visits typically range from $100 to $250 in total depending on your location and the scope of work needed.

Start by unplugging the dishwasher or turning off the circuit breaker to disconnect power completely. Then locate the external antenna and inspect all wiring connections in that circuit, reseating any loose connectors and cleaning any corroded terminals. If the connections are secure and the code returns after restoring power, the external antenna itself likely needs to be replaced.

A power reset may temporarily clear the code from the display, but if the underlying antenna connection problem has not been repaired, the fault will return once the control board checks the circuit again. A permanent fix requires physically inspecting, reseating, or replacing the components in the external antenna circuit.