E4
Frigidaire Dryer
Severity: ModerateWhat Does This Error Mean?
E4 on a Frigidaire dryer means the moisture sensor is giving bad readings. The dryer uses this sensor to know when clothes are dry. A coating of dryer sheet residue is the most common cause — and easiest to fix.
Affected Models
- Frigidaire Electric Dryer
- Frigidaire Gas Dryer
- Frigidaire Gallery Dryer
- Frigidaire Affinity Dryer
Common Causes
- The moisture sensor bars are coated with waxy residue from dryer sheets
- The sensor bars are corroded or physically damaged
- A loose wiring connection to the sensor has broken contact
- The control board is not reading the sensor signal correctly
How to Fix It
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Open the dryer door. Find the two flat metal sensor bars inside the drum — they are typically located on the front wall below the door opening.
They look like two short, shiny metal strips running parallel to each other.
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Dampen a soft cloth with rubbing alcohol (isopropyl) and scrub both sensor bars gently until they look clean and shiny.
Do not use steel wool or abrasive pads — just a soft cloth. The waxy film from dryer sheets builds up invisibly over time.
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Let the bars dry completely, then run a test load using damp clothes. The dryer should sense the moisture and cycle correctly.
If E4 is gone after cleaning, residue buildup was the cause. Clean the bars every 1 to 3 months to prevent recurrence.
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If E4 returns after cleaning, unplug the dryer and check the wiring harness leading to the sensor bars. Disconnect and firmly reconnect the plug.
The sensor wires are accessible by removing the front panel of the dryer.
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If E4 still persists, the sensor bars need to be replaced. Order the correct part for your Frigidaire model number.
Moisture sensor assemblies typically cost $15 to $40 and take about 30 minutes to replace.
When to Call a Professional
If cleaning the sensor bars doesn't clear E4, the sensor itself may have failed. A technician can test it with a multimeter and replace it for $80 to $150 including parts and labor.
Frequently Asked Questions
Why do dryer sheets cause sensor problems?
Dryer sheets leave a thin waxy film on everything inside the drum — including the sensor bars. This film acts as an insulator, preventing the bars from detecting moisture in the clothes. Switching to wool dryer balls instead of sheets eliminates the problem entirely.
My dryer runs too long and over-dries everything. Could that be E4?
Yes — a coated sensor that always reads 'wet' keeps the cycle running past when clothes are dry. Over-drying wastes energy, wears out fabrics, and causes shrinkage. Cleaning the sensor bars often fixes both the E4 error and the over-drying problem.
Does E4 affect all cycle types?
It mainly affects Auto-Dry cycles, which rely on the moisture sensor to know when to stop. Timed dry cycles run for a set number of minutes regardless of sensor readings. Using a timed cycle is a temporary workaround while you fix the sensor.