Frigidaire Dryer Error Code E66

E66 means the dryer has detected an open circuit in one or more of its thermal limiters, which are safety devices that permanently shut off when internal temperatures get too high. On electric models, the Outlet Thermal Limiter is checked first. On gas models, both the Outlet and Inlet Thermal Limiters must be tested. The code can also appear if the wiring connected to these components is damaged or broken.

No. E66 indicates a thermal safety device has opened, meaning the dryer reached an unsafe temperature or has a compromised safety circuit. Operating the dryer in this condition bypasses a critical protection mechanism and creates a potential fire risk. The dryer should remain off until the cause is identified and the faulty component is replaced.

If only a thermal limiter needs replacement, parts typically cost between $10 and $40 depending on the specific limiter and model, making it one of the more affordable dryer repairs. If a technician is required, labor costs will add to that total, generally bringing the full repair into the $100 to $200 range. Costs can be higher if the overheating event damaged wiring, the heating element, or other components.

A knowledgeable DIYer can diagnose E66 by testing the thermal limiters for continuity using a multimeter. If a limiter has tripped, replacing it is a straightforward repair, but you must also inspect the exhaust vent and surrounding components for damage or the root cause of overheating. If heat damage to wiring or other components is found, a technician may be needed to assess the full extent of the damage.

Resetting the dryer by unplugging it will not clear E66 if the thermal limiter has physically tripped, because a tripped thermal limiter remains open permanently regardless of power cycles. The code will return immediately on restart. The only way to clear the code is to replace the open thermal limiter and resolve any underlying cause of overheating.