Kenmore Dryer Error Code E66

Error code E66 on a Kenmore dryer indicates an open circuit in the thermal limiter system. Thermal limiters are one-time-use safety devices designed to break the circuit permanently when temperatures exceed a safe threshold, protecting the dryer and surrounding area from fire or component damage. On all Kenmore dryer models, E66 points to the Outlet Thermal Limiter as the primary suspect. On gas models specifically, the code also covers the Inlet Thermal Limiter, which monitors air temperature entering the drum or burner assembly. An open circuit in either device will trigger this fault and prevent the dryer from operating.

The most important aspect of diagnosing E66 is understanding that a tripped thermal limiter is a symptom, not the root cause. These components do not fail under normal operating conditions. When a thermal limiter opens, it means the dryer experienced a high-temperature event serious enough to activate the safety cutoff. Common causes of such an event include blocked exhaust ducting, a failed cycling thermostat, restricted airflow through the lint screen or vent path, or a failing heating element that shorted to the dryer cabinet. Before replacing any thermal limiter, the technician must identify and correct the underlying heat source.

Diagnosis begins with a continuity check across both the Outlet Thermal Limiter and, on gas models, the Inlet Thermal Limiter. A functional thermal limiter will show continuity. An open reading confirms the device has tripped. After confirming which limiter has failed, inspect the surrounding components and vent path for evidence of scorching, melting, or blockage. If no further damage is found and the root cause of overheating has been addressed, the thermal limiter can be replaced and the unit retested. Skipping this inspection step risks repeat failure and potential safety hazards.