LG Dryer Error Code E21

E21 on an LG gas dryer means the ignition controller has entered a lockout state after the burner failed to ignite successfully. The dryer attempted to start the gas ignition sequence but could not confirm a stable flame through the flame rod sensor. The lockout is a safety measure to prevent unburned gas from building up inside the appliance.

Yes, this error involves the gas ignition system, and you should not attempt to bypass or ignore it. The lockout function exists specifically to stop the dryer from repeatedly attempting ignition when something is wrong, which could otherwise allow unburned gas to accumulate. Do not operate the dryer until the root cause has been diagnosed and corrected. If you smell gas at any point, leave the area and contact your gas utility immediately.

Repair costs vary depending on which component has failed. A flame rod cleaning or electrode replacement is typically one of the lower-cost repairs, while replacing gas valve coils or an ignition controller module involves higher parts costs. Including labor, most E21-related repairs fall somewhere in the range of $100 to $350, though prices vary by region and the specific parts required.

Some steps are accessible to a knowledgeable DIYer, such as checking that the gas supply valve is fully open, cleaning a contaminated flame rod, or inspecting the spark electrode for visible damage. However, testing gas valve coil resistance and diagnosing the ignition controller requires a multimeter and familiarity with live appliance circuits. If you are not comfortable working with gas components or electrical testing, a qualified technician should handle the repair.

Resetting the dryer by unplugging it or cycling the power may temporarily clear the displayed code, but it will not fix the underlying ignition problem. If the root cause is not addressed, the dryer will attempt ignition again, fail, and return to lockout, displaying E21 again. A reset is only useful as part of troubleshooting after a repair has been made.