Whirlpool Dryer Error Code F3E3

F3E3 means the control board detected an open circuit in the inlet thermistor, with a resistance reading above 245k ohms. This corresponds to a sensed temperature below 18°F, which tells the board the thermistor is either faulty or has lost its electrical connection. The dryer stops operating because it can no longer safely monitor incoming air temperature.

You should not continue using the dryer while F3E3 is active. The inlet thermistor is part of the dryer's thermal protection system, and without an accurate temperature reading, the control board cannot prevent the dryer from overheating. Running the dryer in this condition creates a potential fire risk.

No, the inlet thermistor and the thermal fuse are different components with different functions. The thermal fuse is a one-time safety device that permanently cuts power to the dryer if a temperature limit is exceeded. The inlet thermistor is a variable-resistance sensor that continuously reports temperature data to the control board. Both can cause a no-heat or no-run condition, but they require different diagnostic steps and different replacement parts.

Whirlpool's service manual directs you to TEST #4a: Thermistors on page 17 as the first step. This test walks you through checking the resistance of the inlet thermistor and the continuity of its wiring harness. If the thermistor reads open or out of range, replace it. If the thermistor tests correctly, inspect the wiring and connectors between the thermistor and the control board for damage or corrosion before considering a control board replacement.

If the inlet thermistor is the cause, the part typically costs between $10 and $30, and replacing it is a manageable DIY repair involving unplugging the dryer, accessing the thermistor, and swapping the component. If the fault is in the wiring, cost depends on whether a connector or a section of harness needs replacing. A control board, the most expensive scenario, can run $100 to $250 or more for the part alone. Professional labor adds $75 to $150 per hour depending on your area.