The E31 error on your Frigidaire dryer means the control board has detected a problem with the moisture sensor circuit. This usually points to dirty sensor strips, a wiring fault, or a failing sensor component, and it’s often fixable without calling a technician.

Error code E31
Meaning Moisture sensor circuit fault or communication failure
Severity Medium — dryer may still run but won’t sense dryness properly
Time to fix 10–30 minutes
Tools needed Soft cloth, rubbing alcohol, multimeter (optional)

What the E31 error means

Frigidaire dryers use two metal moisture sensor strips inside the drum to detect how damp your clothes are during a cycle. The E31 code appears when the control board can’t get a proper reading from these sensors, either because the signal path is broken, dirty, or shorted. Unlike a heating fault, this error is specifically tied to the sensing system rather than the drying mechanism itself.

Common causes

  • Dirt, fabric softener residue, or lint buildup coating the moisture sensor strips
  • Loose or corroded wiring connector between the sensor and the control board
  • A failed or cracked moisture sensor bar inside the drum
  • Static buildup interfering with the sensor signal
  • A faulty main control board misreading sensor input
  • Water or excessive humidity affecting internal wiring

How to fix the E31 error

  1. Power down the dryer: Unplug it or switch off the breaker for at least one minute to reset the control board.
  2. Clean the moisture sensor strips: Open the door and locate the two thin metal strips inside the drum, usually near the front. Wipe them with a soft cloth dampened with rubbing alcohol to remove residue.
  3. Check the wiring connections: Behind the drum or near the control panel, inspect the sensor wiring harness for looseness, corrosion, or damage, and reseat the connector firmly.
  4. Run a test cycle: Restart the dryer with an empty drum on a timed cycle and watch for the error to reappear.
  5. Test the sensor with a multimeter: If the error persists, check continuity across the sensor strips and wiring; no continuity means the sensor bar needs replacing.
  6. Replace the control board if needed: If sensors and wiring test fine but the error continues, the main control board may be misreading input and require replacement.

FAQ

Can I still use my dryer with an E31 error showing?
You can often run a timed dry cycle manually, but automatic sensor-based drying won’t work correctly until the fault is fixed.

Will cleaning the sensor strips really fix E31?
Yes, in many cases residue buildup is the main cause, and a simple alcohol wipe restores proper sensor readings.

How do I know if it’s the sensor or the control board?
If cleaning and wiring checks don’t resolve it, testing the sensor strips with a multimeter for continuity will confirm whether the sensor or the board is at fault.