F3E3
Whirlpool Dryer
Severity: MinorWhat Does This Error Mean?
The F3E3 error on a Whirlpool dryer means the moisture sensor has a fault. The moisture sensor is a pair of metal strips inside the drum that detect how damp your clothes are. The dryer uses this to automatically end the cycle when clothes are dry — no timer needed. When the sensor circuit reads outside its expected range, F3E3 is triggered. Your dryer may still run, but auto-dry cycles will not work correctly.
Affected Models
- WED5000DW
- WED4815EW
- WED6620HC
- WED7500GC
- WED8540FW
- Most Whirlpool dryers with automatic sensor drying
Common Causes
- Moisture sensor strips are coated with dryer sheet residue, reducing their conductivity
- Corroded or damaged sensor strips from years of use and exposure to heat
- Open or broken wire between the sensor strips and the control board
- Failed control board circuit that reads the moisture sensor signal
- Lint buildup around the sensor strips interfering with the electrical contact
How to Fix It
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Locate the moisture sensor strips. Open the dryer door and look inside the drum near the lint filter opening — you will see two small metal bars or strips running parallel, usually about 2 to 3 inches apart on the front baffel or drum surface.
The exact location varies by model, but the sensor is always inside the drum where clothes tumble past it.
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Clean the sensor strips with a cotton ball or soft cloth dampened with isopropyl alcohol (90% or higher). Rub gently to remove any dryer sheet coating, mineral deposits, or residue.
Dryer sheet residue is a waxy coating that insulates the sensor strips and prevents them from detecting moisture. This is the number one cause of sensor errors and is completely free to fix.
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After cleaning, unplug the dryer for 1 minute, plug it back in, and run a normal auto-dry cycle with a load of damp laundry. Watch to see if F3E3 returns or if the dryer now shuts off correctly at the end of the cycle.
It may take one or two cycles for the control board to verify that the sensor is reading correctly before clearing the fault.
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If F3E3 persists after cleaning, inspect the sensor wiring. Unplug the dryer and trace the wires from the sensor strips back to the control board. Look for any chafed, broken, or disconnected wires.
The wiring to the moisture sensor is often very fine and can be broken by drum movement if it becomes caught on something inside the dryer.
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If the wiring is intact, test the sensor strips with a multimeter on resistance mode. Wet your fingers and hold both strips at the same time — a good sensor shows a resistance reading. If you get infinite resistance (open circuit) even with wet fingers, the sensor strips have failed and need replacement.
Sensor strip replacement is an inexpensive repair. Match the part to your dryer model number.
When to Call a Professional
Cleaning the sensor is a free fix worth trying first. If the error persists, sensor strip replacement costs $10 to $30. If the wiring and sensor are fine, the control board is the likely cause — board replacement costs $80 to $200.
Frequently Asked Questions
Will F3E3 stop my dryer from running at all?
In most cases no — the dryer will still run on timed cycles. However, automatic sensor drying (where the dryer decides when clothes are dry) will not work correctly. You may find clothes coming out still damp, or the dryer running too long and over-drying clothes.
How often should I clean the moisture sensor?
Clean the sensor strips every 1 to 3 months, or any time you notice the dryer is not shutting off at the right time. If you use dryer sheets frequently, clean more often — they leave a coating faster.
Can I use sandpaper to clean the moisture sensor?
No. Sandpaper can scratch and damage the sensor surface, making the problem worse. Always use isopropyl alcohol and a soft cloth or cotton ball. Gentle rubbing is all that is needed to remove residue without harming the sensors.