Frigidaire · Dryer Moderate

E66 — Heater feedback circuit failure

Main control isn't seeing the expected feedback from the heater circuit. Could be a wiring issue, a sensor on the heater leg, or a control board fault.

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

How to fix it

  1. Unplug the dryer.
  2. Inspect heater element terminals and connector at main control for burn marks, looseness, corrosion.
  3. Reseat all connectors firmly.
  4. Check thermistor resistance per service sheet.
  5. If wiring and sensors test good, replace the main control board.
  6. Run test cycle to confirm clearance.

Why it happens

Typical signs: E66 on display · Cycle aborts shortly after start · Intermittent or no heat · Code returns after reset

  • Loose or corroded heater wiring connection Especially at element terminals or main board P-connector.
  • Failed thermistor in heater feedback loop Sensor reports wrong value.
  • Defective main control board Feedback input circuit failed.

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 main control board 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 E4B E4B — Inlet thermistor shorted E5A E5A — Heater on but no temperature rise

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.