LG Dryer E4 Error Code — What It Means
On LG dryers and Stylers with steam capability, the E4 code indicates the heater inside the steam generating component has failed to operate. The machine has detected that the steam heater circuit cannot produce the heat required for the steam cycle. This is not a general dryer fault. It is specific to models with a water dispenser or reservoir that feeds a steam heater assembly.
Common Causes
- Contaminated water in the dispenser or tank LG warns that detergent, fabric softener, or any liquid other than water will damage the heater and trigger the fault.
- Lime scale or mineral buildup on the heater surface Hard water leaves deposits that insulate the heater element and cause overheating or electrical failure.
- Reused or standing water in the drain tray Old water left in the tray or tank grows residue that contaminates the steam system and clogs the heater.
- Failed steam heater element or control circuit The heater assembly itself may have burned out or the control board no longer sends power to the circuit.
Step-by-Step Fix
- Unplug the dryer from the wall and wait two minutes to reset the control board, then plug it back in and test the steam cycle.
- Remove and inspect the water tank or dispenser. Confirm you have used only clean water and never added detergent, fabric softener, or other liquids.
- Clean the water tank and drain tray thoroughly. Wash both with warm water to remove any scale, sediment, or old residue, then rinse and dry completely.
- Empty any standing water from the drain tray and refill the dispenser with fresh water if your model requires it.
- Run a short steam cycle to verify the code has cleared after cleaning and reset.
- If E4 returns, request service. The steam heater assembly or its control circuit has likely failed and requires diagnosis with test equipment.
- During the service visit, the technician will test voltage and continuity in the steam heater circuit and replace the defective component found by those tests.
Parts Often Needed
| Part | Notes |
|---|---|
| Steam heater assembly | Amazon | The heater element and housing inside the steam generator, replaced when the element itself has failed. |
| Water tank or dispenser | Amazon | May need replacement if cracked, leaking, or heavily scaled beyond cleaning. |
When to Call a Pro
Call a professional if the E4 code persists after you have unplugged the unit, cleaned the water tank and drain tray, and confirmed only water has been used. The repair requires live voltage tests of the steam heater circuit and control board outputs, tools most homeowners do not own. LG directs you to request service when the code returns after reset and cleaning because the fault lies in a sealed steam assembly that is not user-serviceable.