What E4 (Steam Heater Error) Means
E4 means the heater inside the Styler's steaming device has failed to work, per LG's dedicated E4 Help Library article, which names a specific and important cause: using anything other than plain water in the water dispenser. LG specifically warns against fabric softener, detergent, or any other liquid, and against unpurified ground water, water reused from the drain tray, or water left sitting in the dispenser for a long time - because lime scale or other residue from poor water quality can coat the heater surface and cause it to overheat and become damaged.
Common Causes of E4 (Steam Heater Error)
- Fabric softener, detergent, or another liquid put in the water dispenser instead of plain water
- Unpurified ground water used, allowing mineral scale to build up on the heater
- Water reused from the drain tray
- Water left standing in the dispenser for a long time before use
🔧 One Safe Check You Can Try
Empty the water dispenser and refill with clean, fresh tap water only - never fabric softener, detergent, or any other liquid - and avoid reusing water sitting in the drain tray or leaving water in the dispenser for extended periods between uses; if E4 appeared after you already used the wrong liquid, the heater itself may already be damaged and need replacement.
⚠ Why You Shouldn't Go Further Than That
- If you've already run the Styler with something other than water in the dispenser, don't keep running cycles hoping it clears - scale or residue damage to the heater from a wrong liquid is often already done and needs a technician to inspect and likely replace the heater.
- Even with only water used correctly going forward, if E4 persists, the heater itself has failed and needs professional replacement rather than continued troubleshooting.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.