Frigidaire · Dryer Moderate

E4A — Inlet thermistor open

The control sees the inlet (heater housing) thermistor as open circuit. Heater command is disabled for safety until the sensor reads normally.

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

How to fix it

  1. Unplug the dryer.
  2. Access the heater box (rear panel on electric models).
  3. Locate inlet thermistor on the heater housing and inspect connector.
  4. Reseat the connector; ohm out the sensor — should read in spec at room temperature.
  5. Replace thermistor if open.
  6. If sensor and wiring are good, replace main control board.

Why it happens

Typical signs: E4A on display · No heat · Cycle aborts shortly after start

  • Open inlet thermistor Sensor failed open.
  • Broken wire to inlet thermistor Often where harness flexes past the drum.
  • Unplugged connector May have come loose during prior service.
  • Failed main control board Less common.

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 E4B E4B — Inlet thermistor shorted 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.