Frigidaire · Dryer Moderate

E4B — Inlet thermistor shorted

Inlet thermistor resistance is too low — sensor is shorted or the wiring is shorted to ground. Heater disabled until cleared.

Keep using it?
Yes, with caution
DIY difficulty
Moderate
Verified against
frigidaire.com ↗

How to fix it

  1. Unplug the dryer.
  2. Inspect the inlet thermistor harness for pinch points or damaged insulation.
  3. Measure thermistor resistance — replace if reads near zero ohms.
  4. Repair or replace harness if shorted.
  5. If sensor and wiring test good, replace main control board.
  6. Verify normal startup after repair.

Why it happens

Typical signs: E4B displayed · No heat · Cycle aborts · Code reappears after reset

  • Shorted inlet thermistor Internal failure.
  • Wire pinched against metal frame Shorts the sensor signal to ground.
  • Failed main control board Input circuit damaged.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • Frigidaire dryer thermistor Common replacement
    Amazon →

More Frigidaire dryer codes

AD AD — Automatic dry / sensor dry not detecting moisture AF AF — Restricted airflow E11 E11 — Cycle taking too long E4A E4A — Inlet thermistor open E5A E5A — Heater on but no temperature rise E5B E5B — Exhaust thermistor open / under temperature

All Frigidaire codes → All dryer codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: frigidaire.com.