E4B Moderate Moderate DIY

Frigidaire Dryer E4B — Inlet thermistor shorted

Frigidaire Dryer · Error code E4B

What E4B Means

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

Symptoms

  • E4B displayed
  • No heat
  • Cycle aborts
  • Code reappears after reset

Common Causes

1
Shorted inlet thermistor

Internal failure.

2
Wire pinched against metal frame

Shorts the sensor signal to ground.

3
Failed main control board

Input circuit damaged.

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.

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.

Common replacement Frigidaire dryer thermistor View on 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 →

Verified against manufacturer documentation: frigidaire.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.