Samsung Dryer Error Code tO — Drum Temperature Too High
What this means
The tO error code indicates the temperature inside the drum has exceeded the dryer's maximum operating threshold. This is distinct from the HC code in that it specifically measures drum air temperature rather than heating circuit temperature. The most common cause is a severely clogged vent, but it can also indicate a thermostat or element failure.
Step-by-step fix
4 stepsUnplug and cool down
Immediately unplug the dryer. Open the door and let the dryer cool completely before inspecting. Do not run the dryer again until the cause is found.
Overheating is a fire hazard. Take this code seriously.
Clean the entire exhaust system
Thoroughly clean the lint filter, lint trap housing, exhaust hose, wall ductwork, and exterior vent hood. Any restriction in the exhaust path will cause heat to build up in the drum.
A completely blocked vent can cause drum temperatures to exceed 200°F.
Test the thermostats
Test the cycling thermostat and the high-limit thermostat for continuity. A failed cycling thermostat will not cycle the heater off during normal operation, causing overheating.
If the high-limit thermostat has blown, it was protecting the dryer from an overheating condition — find the root cause before replacing.
Check for a grounded heating element
Test the heating element for a ground fault as described in the HC error code fix. A grounded element runs continuously regardless of thermostat control.
When to call a professional
If the vent is clean and all heating components test normally, the control board may be failing to turn off the heater. A technician should inspect the board and relays.
Related error codes
The dryer has detected an abnormally high temperature.
Advanced Fix · 30–60 minutes
The dryer is not heating or is overheating.
Advanced Fix · 30–60 minutes
The dryer has detected restricted exhaust airflow.
Easy Fix · 20–45 minutes
The dryer has detected dangerously high temperatures.
Moderate Fix · 30–60 minutes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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