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How to Enter Diagnostic Mode on a LG Dryer

LG dryers run an automatic airflow test (D80/D90/D95 codes) and support SmartDiagnosis through the ThinQ app.

Step-by-Step: LG Dryer Diagnostics

  1. 1

    Read the code from the display. The D-series codes are percentages of duct blockage detected: D80 = 80% blocked, D90/D95 = nearly full blockage.

  2. 2

    Run Flow Sense check: start a Time Dry cycle — the airflow test runs in the first minutes and reports D-codes if restriction is found.

  3. 3

    Use SmartDiagnosis via the ThinQ app for stored fault history on connected models.

  4. 4

    For no-heat complaints without codes: unplug and measure the thermistor (about 10kΩ at room temperature) and check both legs of the 240V supply — a tripped single breaker leg gives motor-runs-no-heat symptoms (nP code on some models).

💡 Good to know: D-codes measure the duct system, not the dryer. Clean from the dryer outlet to the exterior hood — booster fans and long runs are common offenders.

Found a Code? Look It Up

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

D90
Duct blockage detected — exhaust duct 90% blocked
⚠ High Severity
D95
Duct blockage detected — exhaust duct 95% blocked
⚠ High Severity
nP
No power to the heating element
⚠ High Severity
GAS
Gas supply error — no gas detected (gas dryer models only)
⚠ High Severity
dH
High temperature error — drum temperature exceeded safe limit
⚠ High Severity
nF
No heat / airflow fault — dryer runs but cannot maintain heating
⚠ High Severity

Frequently Asked Questions

Can I keep using my LG dryer with a D80 code? +
It will run, but with 80% duct blockage drying is slow and the thermal cutoff can trip — and a restricted duct full of lint is a fire risk. Clean the vent run before continuing to use it.
How to Reset a LG Dryer → ← All LG Dryer Error Codes