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Whirlpool Dryer F3 E3 Error Code: Moisture Sensor Fault

Quick Answer

F3 E3 on a Whirlpool dryer means the moisture sensor has stopped working correctly. The most common cause is a coating of fabric softener or dryer sheet residue on the two sensor bars inside the drum. Clean the bars with rubbing alcohol on a cotton swab first; this fixes the issue at no cost in many cases.

F3 E3 on a Whirlpool dryer means the moisture sensor has stopped working correctly. The most common cause is a coating of fabric softener or dryer sheet residue on the two sensor bars inside the drum. Clean the bars with rubbing alcohol on a cotton swab first; this fixes the issue at no cost in many cases. If cleaning does not work, test the sensor wiring and then replace the moisture sensor assembly for $20-40.

WhirlpoolDryerSeverity: moderateDifficulty: intermediate88% DIY Success
Time to Fix
15–60 min
Difficulty
intermediate
Parts Cost
$20 – $40
Tools Needed
Isopropyl alcohol (70%+), Cotton swabs

What Does the F3 E3 Code Mean?

The two metal sensor strips inside your dryer drum are either coated with residue or have failed. A quick clean with rubbing alcohol often fixes this for free. If not, the sensor assembly needs replacement.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Fabric softener or dryer sheet coating on sensor bars blocking conductivity40%
Sensor wiring fault or broken harness24%
Control board input circuit for moisture sensor failed22%
Moisture sensor assembly failure14%

Symptoms You May Notice

  • F3 E3 displayed on control panel
  • Dryer shuts off while clothes are still wet
  • Dryer runs the maximum cycle time on every load
  • Timed dry cycles work but automatic sensing cycles do not
  • Clothes overdry or shrink (sensor stuck in dry-reading state)

Can you reset a Whirlpool dryer to clear the F3 E3 code?

Unplug the dryer for 60 seconds after cleaning the sensor bars or replacing the sensor assembly. Plug back in. The code should clear on the next successful sensing cycle. Running a timed dry cycle first (which bypasses moisture sensing) can confirm the dryer functions before testing auto-sensing.

Tools Required for Diagnosis

Isopropyl alcohol (70%+)Cotton swabsPhillips head screwdriverMultimeter (continuity mode)Fine scotch-brite pad (optional, for heavy residue)

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Locate the moisture sensor bars

Locate the moisture sensor bars. They are two metal strips mounted on the front bulkhead inside the drum, usually below the lint screen opening. They look like two parallel metal lines.

2

Clean both sensor bars with isopropyl alcohol (rubbing alcohol

3

If cleaning does not clear the code

4

Inspect the wire harness running from the sensor bars to the

5

Replace the moisture sensor assembly

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Moisture Sensor AssemblyWP8566574 · $20–$40

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $30 (Parts) vs $750 (New Machine)

Frequently Asked Questions

Why do dryer sheets cause F3 E3 on Whirlpool dryers?
Dryer sheets release a waxy coating as they heat up. This coating deposits on the moisture sensor bars over months of use. The waxy film is non-conductive, so it blocks the low-voltage signal that travels between the two bars through wet laundry. The control board sees no signal and codes a sensor fault.
How often should I clean the moisture sensor bars?
If you use dryer sheets regularly, clean the sensor bars every 1-3 months with rubbing alcohol. If you use liquid fabric softener in the washer only and no dryer sheets, cleaning once or twice a year is sufficient.
Can I run the dryer in timed mode while waiting for a new moisture sensor?
Yes. Timed dry cycles bypass the moisture sensor entirely. Select a timed dry cycle and set the time manually based on your load. This is safe to do indefinitely but you will need to monitor the load yourself to avoid over-drying.
Is F3 E3 the same as F3 E2 on Whirlpool dryers?
No. F3 E3 is the moisture sensor fault. F3 E2 on some models indicates an inlet thermistor issue rather than the moisture sensor. Always note the full code including both digits to get the correct repair path.
After cleaning the sensor the code cleared but came back in a week. Why?
Heavy dryer sheet use re-coats the bars quickly. Consider switching from dryer sheets to wool dryer balls, which do not leave residue. If the code comes back even without dryer sheets, the sensor assembly itself is degrading and needs replacement.

Related Whirlpool Dryer Error Codes

Code: HUBWhirlpool Dryer Error Codes GuideCode: F9 E2Whirlpool Dryer F9 E2 Error Code: Outlet Thermistor Failure

Same Fix Works on These Brands

Whirlpool shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

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Models Known to Experience F3 E3 Errors

This repair applies to most Whirlpool dryers with this error code. Common model numbers include:

WED5000DW, WED8500DC, WED9620HC, WED7300DW, WED4815EW

Last verified for technical accuracy on March 14, 2026