How to Enter Diagnostic Mode on a Samsung Dryer

Samsung dryers show fault codes on the front display. A vent-blockage test and SmartThings self-check cover most diagnostics owners need.

Step-by-Step: Samsung Dryer Diagnostics

1
Read the active code from the display — no special mode is needed for current faults.
2
Run the vent blockage test on models with 'Vent Sensor' or after a Clg code: this automatic airflow check runs at the start of Time Dry cycles on many models.
3
Use the SmartThings app self-check (2018+ models) to read stored fault history.
4
Check the thermistor reading: with the dryer unplugged, the thermistor (on the heater housing) should read roughly 10kΩ at room temperature on a multimeter — the most useful single measurement for heat-related codes.
5
The tech sheet with the model-specific service-mode sequence is folded inside the control console or behind the lower access panel.

💡 Good to know: Most Samsung dryer complaints (Clg, HC, no-heat) trace to lint restriction in the duct run. Clean the full vent path before testing components.

Found a Code? Look It Up

Once diagnostics shows you a stored code, find its meaning and fix guide in the full Samsung dryer code list. These are the highest-priority codes on this platform:

Heater fault — drum not heating or overheating

⚠ High Severity

Frequency error — abnormal power supply frequency

⚠ High Severity

High temperature detected — overheating safety shutdown

⚠ High Severity

1 AC

Air circulation error — insufficient airflow detected through the drum

⚠ High Severity

No gas — burner failed to ignite (gas models)

⚠ High Severity

Frequently Asked Questions

How do I reset a Samsung dryer after a Clg code? +

Clean the lint screen and the full exhaust duct, then power-cycle the dryer for 60 seconds. Clg is a clog warning — it returns until airflow is actually restored.

How to Reset a Samsung Dryer → ← All Samsung Dryer Error Codes