LG Dryer Error Code tO

The tO code on an LG dryer indicates a temperature out-of-range condition. It is most commonly caused by a clogged lint screen or a blocked exhaust vent that traps heat inside the dryer. The dryer's thermistor detects the abnormal temperature and triggers this code. In some cases, a faulty thermistor can cause the code even when airflow is unrestricted.

You should not continue running the dryer while the tO code is active. A restricted vent or an overheating condition can create a fire hazard, since trapped heat and accumulated lint are a dangerous combination. Address the underlying cause before resuming normal use.

If the fix is simply cleaning the lint screen and clearing the exhaust duct, there is no parts cost involved. If the exhaust duct needs replacement, materials typically range from around 10 to 40 dollars depending on the duct type and length. A thermistor replacement part generally costs between 15 and 50 dollars, with professional labor adding roughly 75 to 150 dollars if a technician is hired for the repair.

Start by cleaning the lint screen thoroughly and inspecting the exhaust duct for kinks, blockages, or excessive length. Check the exterior vent cap to confirm the flap opens freely and there is no debris blocking it. If the vent system is clear and the code returns, test the thermistor's resistance with a multimeter to determine if the sensor needs replacement.

A reset may temporarily clear the tO code, but it will return if the underlying problem is not resolved. If the lint screen is clogged or the vent is restricted, the dryer will detect the out-of-range temperature again during the next cycle. Fix the airflow issue or replace the faulty thermistor first, then reset the unit.