Samsung · Washer / dryer
tO Temperature sensor open-circuit (dryer)
What this code means
The dryer's thermistor circuit is reading as open — no signal at all reaching the control board.
Most likely causes
- Disconnected thermistor connector
- Broken wire in the harness
- Failed thermistor
What to try first
Unplug the dryer for a minute to reset; a recurring tO code usually means the thermistor or its wiring needs replacement.
Safety note: if this code returns after one clean reset, stop resetting it — repeated lockouts usually mean a real fault that needs a licensed technician. Never bypass a safety switch.
Find the part on Amazon →FAQ
What does Samsung error code tO mean?
Temperature sensor open-circuit (dryer). The dryer's thermistor circuit is reading as open — no signal at all reaching the control board.
Can I fix Samsung code tO myself?
Usually not. Unplug the dryer for a minute to reset; a recurring tO code usually means the thermistor or its wiring needs replacement. If the code returns after one reset, it needs a licensed technician.
What causes Samsung code tO?
The most common causes are: disconnected thermistor connector; broken wire in the harness; failed thermistor.
Other Samsung washer or dryer codes
All Samsung washer or dryer error codes →
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This information may contain errors or not apply to your exact model — always double-check it against your appliance's own manual before acting. If there's any chance of a gas, fire, electrical, carbon monoxide, or other safety hazard, stop and call a licensed professional or the appropriate agency (e.g. your gas utility) instead of relying on this page alone.