F4E3
Whirlpool Dryer
Severity: ModerateWhat Does This Error Mean?
The F4E3 error on a Whirlpool dryer means the inlet thermistor circuit has an open reading — the sensor is either disconnected or has failed in an open-circuit condition. The inlet thermistor measures the temperature of air entering the drum from the heating element. Without an accurate inlet temperature reading, the dryer cannot safely regulate heat. The dryer will typically stop heating or refuse to run to prevent overheating.
Affected Models
- WED5000DW
- WED8000DW
- WED9290FW
- WED6620HC
- WGD8000DW
- Whirlpool electric and gas dryers with electronic temperature control
Common Causes
- Inlet thermistor (temperature sensor) has burned out and reads open circuit
- Wiring connector to the inlet thermistor has pulled loose or corroded
- Wire harness to the thermistor is broken — common in high-vibration areas near the drum
- Thermistor mounting has shifted and the sensor is no longer reading air temperature correctly
- Main control board thermistor input circuit has failed — less common
How to Fix It
-
Unplug the dryer. Locate the inlet thermistor — it is typically mounted near the heating element housing or air inlet duct. On most Whirlpool models it is at the back of the dryer cabinet behind the drum.
Consult your model's parts diagram (available at Whirlpool's website or appliance parts sites using your model number) to find the exact thermistor location.
-
Check the thermistor wiring connector first. Disconnect and firmly reseat the connector. Inspect for corroded or damaged pins. A loose connector is often the sole cause of an open-circuit reading.
This is a free fix that takes under two minutes. Always do this before buying replacement parts.
-
Test the inlet thermistor with a multimeter on resistance (ohms) mode. At room temperature (around 70°F / 21°C), a healthy thermistor typically reads between 10,000 and 50,000 ohms depending on the model.
An open reading (infinite resistance) at room temperature confirms the thermistor has failed. Confirm the expected resistance for your specific model in the service documentation.
-
If the thermistor reads open, replace it. Thermistors are held in place by a clip or one or two screws. Disconnect the wires, remove the old sensor, and install the new one in the same position.
Make sure the new thermistor is positioned so it can accurately sense the incoming air temperature — do not let it rest against the cabinet wall or heating element housing.
-
Reassemble the dryer, restore power, and run a full cycle to confirm the error is cleared and the dryer heats correctly.
If F4E3 returns after thermistor replacement, verify the wiring back to the control board. If wiring is intact, the board input circuit may have failed.
When to Call a Professional
Inlet thermistor replacement is a manageable DIY repair. Thermistors cost $10 to $25 and are straightforward to replace. If a new thermistor does not resolve F4E3, have a technician check the control board input circuit.
Frequently Asked Questions
What is the difference between F4E3 and a regular F4 error?
F4 is a general inlet thermistor error — the reading is out of range (could be too high or too low). F4E3 specifically means the thermistor is reading open circuit — no signal at all. This narrows the diagnosis to a disconnected or failed sensor rather than a thermistor that is reading incorrectly.
Can my dryer overheat because of F4E3?
The dryer is designed to stop heating when a thermistor fault is detected, specifically to prevent overheating. So while F4E3 can stop your dryer from heating at all, it also protects the machine from running dangerously hot without proper temperature monitoring.
How long does thermistor replacement take?
Once you have accessed the thermistor (which requires opening the back panel), the actual swap takes about 5 minutes. Total repair time including disassembly and reassembly is usually 30 to 60 minutes for someone doing it for the first time.