Electrolux Dryer Error Code E66

Error code E66 on an Electrolux dryer signals an open circuit condition in the thermal limiter circuit. The dryer's control board monitors continuity through the outlet thermal limiter, and on gas models, also through the inlet thermal limiter. When either of these safety devices opens, the circuit breaks and the E66 code is triggered. Thermal limiters are single-use, non-resettable safety components designed to permanently open when exposed to temperatures above their rated threshold, cutting power to the heating circuit to prevent fire or further damage.

The outlet thermal limiter is present on all models and is positioned to monitor exhaust-side temperatures. Gas models include a second limiter at the inlet, adding another layer of thermal protection near the burner assembly. When a limiter trips, it almost always indicates that an actual high-temperature event occurred. The most common root cause is restricted airflow, such as a clogged lint filter, blocked exhaust duct, or kinked vent hose, which forces heat to accumulate inside the drum cabinet. A faulty cycling thermostat that fails to regulate heat properly can also drive temperatures high enough to trip the limiter.

Diagnosis requires testing each thermal limiter for continuity using a multimeter. An open reading confirms the limiter has tripped. Before replacing the limiter, the dryer should be thoroughly inspected for signs of scorching, melted wiring, or heat damage to adjacent components. The underlying cause of the overtemperature condition must be corrected before reinstalling a new limiter, otherwise the replacement will trip again during the next operating cycle.