GE Dryer Error Code tO

The tO code on a GE dryer means the control board has detected an open circuit in the thermistor, which is the component that monitors drying temperature. An open circuit means the electrical path carrying the temperature signal is broken, so the board cannot read any temperature data. The dryer will typically disable heating until the fault is resolved. The issue is most often caused by a loose connector, a broken wire, or a failed thermistor.

You should not continue running the dryer with the tO error active. Because the control board cannot read temperature from the thermistor, it cannot properly regulate the heating element. This creates a risk of overheating the drum and laundry load. Stop using the dryer until the thermistor circuit is inspected and repaired.

If the fix is simply reseating a loose connector, there is no parts cost involved. A replacement thermistor typically costs in the range of $15 to $40 for the part. If a professional technician is needed for diagnosis and repair, total service costs including labor generally fall in the range of $80 to $200 depending on your location and the extent of the repair.

Many cases of the tO error can be resolved without professional help by checking the thermistor's wiring connector and ensuring it is fully seated. If the connector looks secure, use a multimeter to test the thermistor for continuity. A thermistor that reads infinite resistance has failed and needs replacement, which is a straightforward part swap for most DIYers comfortable working inside appliances.

A reset may temporarily clear the tO code from the display, but the fault will return as soon as the dryer starts and the control board again detects no signal from the thermistor. The underlying open circuit in the thermistor wiring or the sensor itself must be repaired before the code will stay clear.