Frigidaire · Washer Serious

E66 — Heating element relay failure (steam/heated wash models)

On models with an internal water heater, the main board detected the heater relay stuck or the heater drawing wrong current. The washer disables heating to prevent damage.

Keep using it?
Limited use only
DIY difficulty
Hard
Verified against
frigidaire.com ↗

How to fix it

  1. Unplug and access the heating element (usually at the bottom rear of the tub).
  2. Measure heater resistance — open or shorted means replace.
  3. Test thermistor resistance against the service sheet temperature curve.
  4. If element and thermistor are fine, replace the main control board (relay welded).

Why it happens

Typical signs: No hot water from heater · Steam cycle won't run · E66 mid-cycle · Breaker trips

  • Failed heater relay on main board Welded or open contacts.
  • Shorted or open heating element Element failed — typically reads 10-30 ohms when healthy.
  • Failed heater thermistor Bad temp sense triggers overcurrent logic.

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 washer heating element Common replacement
    Amazon →
  • Frigidaire washer thermistor Common replacement
    Amazon →

More Frigidaire washer codes

E10 E10 — Water fill problem E11 E11 — Fill time too long E13 E13 — Water leak or air leak in pressure system E20 E20 — Drain pump won't pump out E21 E21 — Slow drain / water remains in tub E23 E23 — Drain pump relay fault on control board

All Frigidaire codes → All washer codes →

Frequently asked questions

What does the E66 code mean on a Frigidaire washer?

On models with an internal water heater, the main board detected the heater relay stuck or the heater drawing wrong current. The washer disables heating to prevent damage.

What causes the E66 code on a Frigidaire washer?

Failed heater relay on main board: Welded or open contacts. Shorted or open heating element: Element failed — typically reads 10-30 ohms when healthy. Failed heater thermistor: Bad temp sense triggers overcurrent logic.

Is it safe to keep using a Frigidaire washer with a E66 error?

Limited use only. This is rated a serious-severity fault.

How do I fix E66 on a Frigidaire washer?

Unplug and access the heating element (usually at the bottom rear of the tub). Measure heater resistance — open or shorted means replace. Test thermistor resistance against the service sheet temperature curve.

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.