LG Dryer Error Code dH

The dH code on an LG dryer means the thermistor detected a temperature increase of approximately 17 degrees within a 10-second period. The control board interprets this as an abnormal and potentially dangerous rate of heating. The fault is most commonly caused by a defective thermistor producing inaccurate readings, though blocked venting can also cause genuine rapid temperature spikes.

You should not continue running the dryer while this code is active. The dH fault indicates either a faulty temperature sensor or a real overheating condition, both of which carry a risk of heat damage to the appliance or a potential fire hazard. Stop using the dryer until the underlying cause has been diagnosed and corrected.

A power cycle or reset may temporarily clear the dH code, but it will return if the underlying problem has not been fixed. Because the fault is tied to a temperature sensor reading or an actual thermal event, resetting without addressing the thermistor or venting issue is not a solution. The code will reappear once the dryer runs and encounters the same condition again.

Yes, a knowledgeable DIYer can address this fault. The primary step is replacing the thermistor, which is generally accessible and does not require advanced tools. You should also inspect the lint filter and exhaust vent for blockages before or alongside the thermistor replacement to rule out an airflow issue.

If the thermistor is the only component needed, parts typically cost in the range of $15 to $40 depending on the specific model. If you hire a technician, labor charges can bring the total repair cost into the range of $100 to $200. Clearing a blocked vent yourself costs nothing beyond your time.