Whirlpool Dishwasher Error Code F1

The F1 code indicates a fault with the NTC thermistor, which is the temperature sensor inside the wash chamber. The control board is detecting a temperature reading outside the normal operating range of -3°C to +85°C, or it has detected that the thermistor circuit is open or shorted. The dishwasher stops the cycle to prevent damage from incorrect water temperatures.

It is not recommended to bypass or ignore the F1 error and continue running the dishwasher. Because one trigger for this fault is an actual overtemperature condition above +85°C, running the appliance without a functioning temperature sensor could allow the water to overheat, potentially damaging the tub, dishes, and internal components. The dishwasher should be diagnosed and repaired before resuming normal use.

Repair costs depend on the root cause. A replacement NTC thermistor is generally an inexpensive part, typically in the range of $15 to $40 for the component alone. If the issue is wiring or a connector, repair costs are mostly labor. A control board replacement is the most expensive scenario, with parts alone often ranging from $80 to $200 or more, plus labor if a technician is involved.

A knowledgeable DIYer can start by checking the thermistor's wiring connector for corrosion or loose connections, which sometimes resolves the fault without any parts. Testing the thermistor resistance with a multimeter requires basic electrical knowledge but is a straightforward diagnostic step. If the thermistor itself has failed, replacing it is a moderate-difficulty repair involving accessing the wash tub and disconnecting the sensor from the harness.

A power reset may temporarily clear the F1 code from the display, but the fault will return as soon as the control board attempts to read the thermistor again during a wash cycle. A reset does not address the underlying hardware problem. The thermistor, wiring, and heating system must be tested and repaired to permanently resolve the fault.