Samsung Dryer Error Code tO

The tO code on a Samsung dryer indicates that the thermistor, the sensor that monitors drum air temperature, is reading a resistance value that is either extremely high or extremely low. This tells the control board that it cannot reliably track the dryer's internal temperature. The dryer will typically stop normal operation until the fault is resolved. The code may point to a failed sensor, a wiring issue, or an overheating condition caused by a blocked vent.

No, you should not continue running the dryer while this code is active. The thermistor is the component that prevents the dryer from overheating, and if it is not functioning correctly, the dryer has no reliable way to regulate its internal temperature. Operating the appliance in this condition creates a potential overheating or fire hazard. Address the fault before resuming use.

If the fix is simply clearing a clogged vent or lint screen, the cost is minimal, just your time or a professional vent cleaning service ranging from roughly $80 to $150. If the thermistor itself needs replacement, the part typically costs between $15 and $40, and a technician's labor charge generally brings the total repair to the $100 to $200 range. Control board replacement, if needed, is significantly more expensive and can run $200 to $400 or more depending on the model.

Yes, in many cases. Start by cleaning the lint screen thoroughly and checking the entire exhaust vent path for obstructions or kinks, since restricted airflow is a common trigger for this fault. If airflow is clear, you can use a multimeter to test the thermistor's resistance; a reading near zero or an open reading confirms the sensor needs replacement. Thermistor replacement is a moderately straightforward repair for someone comfortable working on appliances.

A power reset may temporarily clear the code, but it will return if the underlying problem has not been fixed. Unplugging the dryer for a few minutes and restarting it can be useful as a diagnostic step to see if the fault is intermittent, but a persistent tO code requires actual repair of the thermistor, wiring, or airflow restriction causing the fault.