E66 Serious Hard — consider a tech

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

Frigidaire Washer · Error code E66

What E66 Means

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.

Symptoms

  • No hot water from heater
  • Steam cycle won't run
  • E66 mid-cycle
  • Breaker trips

Common Causes

1
Failed heater relay on main board

Welded or open contacts.

2
Shorted or open heating element

Element failed — typically reads 10-30 ohms when healthy.

3
Failed heater thermistor

Bad temp sense triggers overcurrent logic.

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).

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 washer heating element View on Amazon→ Common replacement Frigidaire washer thermistor View on 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 →

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.