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Samsung Dryer Error Code tO

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 11, 2026
⚠ Medium Severity 🔧 Easy DIY

Thermistor open circuit — temperature sensor disconnected or failed open

The opposite of tS: the control reads infinite resistance on the exhaust thermistor circuit, as if the sensor isn't there at all. Without a temperature reading the dryer refuses to heat. An unplugged connector or a failed-open thermistor are the usual causes.

💰 DIY cost: $10–$25 👨‍🔧 Pro cost: $130–$250 Save $120+ by doing it yourself
Samsung Dryer error code tO on the display panel
How the tO code appears on a Samsung dryer display

What Does Error Code tO Mean on a Samsung Dryer?

Thermistor open circuit — temperature sensor disconnected or failed open.

The opposite of tS: the control reads infinite resistance on the exhaust thermistor circuit, as if the sensor isn't there at all. Without a temperature reading the dryer refuses to heat. An unplugged connector or a failed-open thermistor are the usual causes.

What Causes Error Code tO?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

  1. 1
    Failed (open) thermistor 55% of cases
  2. 2
    Connector unplugged or backed-out pin 30% of cases
  3. 3
    Broken harness wire 15% of cases

How to Fix Samsung Dryer Error Code tO

🔧 Easy DIY Est. time: 10–20 min
⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.
  1. 1

    Reseat the connector

    Unplug the dryer, open the access panel, and firmly reseat the thermistor connector — vibration works them loose, especially after a prior repair.

  2. 2

    Test the thermistor

    Measure across the sensor: ~10kΩ at room temperature is healthy; an open (OL) reading confirms replacement.

  3. 3

    Replace the thermistor

    Swap the sensor on the heater/blower housing.

    🔩 Samsung dryer thermistor ($10–$25)
    ⚠️ Unplug the dryer before removing panels.

How to Reset Error Code tO

Reseat or replace the sensor, then power the dryer and run a short heated cycle to confirm the code is gone.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

Did this guide fix your appliance?

When to Call a Professional

If the sensor and harness both meter fine but tO persists, the main board's sensor input circuit is suspect.

Average professional repair cost for this issue: $130–$250

Related Error Codes

tS
Thermistor short circuit — temperature sensor reading too low resistance
⚠ Medium Severity
tE
Thermistor (temperature sensor) failure
⚠ Medium Severity
HE
Heater fault — drum not heating or overheating
⚠ High Severity

Find Replacement Parts

Use these links to find the exact replacement parts for your Samsung Dryer:

🔩
Search PartSelect
Samsung Dryer repair parts
🔧
Search RepairClinic
Step-by-step video guides

External links — ApplianceErrors.com is not affiliated with these retailers.

More Samsung Dryer Error Codes

OD Vent blockage detected FE Frequency error — abnormal power supply frequency Et Communication error — connection between boards bC2 Button card error — control panel communication failure HC High temperature detected — overheating safety shutdown AE Communication error — internal signal failure

Frequently Asked Questions

What does error code tO mean on a Samsung Dryer? +
Thermistor open circuit — temperature sensor disconnected or failed open
How do I fix error code tO on my Samsung Dryer? +
Start by Unplug the dryer, open the access panel, and firmly reseat the thermistor connector — vibration works them loose, especially after a prior repair.. If that doesn't resolve it, work through each step in the fix guide above.
How do I clear or reset error code tO? +
Reseat or replace the sensor, then power the dryer and run a short heated cycle to confirm the code is gone.
Is error code tO serious? +
Medium severity. The appliance may still operate but the issue should be resolved to prevent further damage.

Sources & References

Content verified against manufacturer service documentation. Last verified: June 11, 2026.

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