Whirlpool Dishwasher Error Code 4-3

Code 4-3 means the control board detected that the wash motor is not running. The board monitors the motor circuit during operation and throws this code when it cannot confirm the motor has started. The root cause can be a loose wiring connection, a failed wash motor, or a fault in the board's Motor Drive/Sense circuit.

No. Code 4-3 means the wash motor is not running, so water is not circulating through the spray arms. Running a cycle will not clean dishes, and depending on the nature of the fault, continuing to attempt cycles could stress other components. The dishwasher should be repaired before returning it to regular use.

Checking and reseating the wiring harness connectors is a DIY-friendly repair that requires only basic tools and comfort working around appliance wiring after disconnecting power. Testing motor resistance with a multimeter is also manageable for someone with basic electrical knowledge. Replacing the wash motor involves removing the lower access panel and disconnecting the motor from the pump assembly, which is moderate in difficulty. Control board replacement is the most involved repair, and if you are not comfortable with appliance electronics, having a technician handle it is reasonable.

Start by unplugging the dishwasher or shutting off the circuit breaker. Access the wash motor wiring harness and check each connector for looseness or corrosion, reseating any that are not fully seated. Use a multimeter to check resistance across the motor terminals and compare the reading to the specification in your model's service manual. If resistance is out of range, replace the wash motor. If wiring and the motor both check out, the control board may need replacement.

If the problem is only a loose connector, the repair costs nothing beyond your time. A replacement wash motor for a Whirlpool dishwasher typically runs between $80 and $180 for the part, depending on the model, with professional labor adding $100 to $200. A control board replacement is the most expensive scenario, often $150 to $300 for the part alone. Checking the wiring connections yourself first is always worth doing before spending money on parts.