Written by
Marcus Lindqvist Appliance Care EditorPublished October 26, 2026
VERIFIED
Error code4
ApplianceCooktop
Quick answer
A 4 tells you something has been sitting on the touch pads too long: metal objects or water, in contact for a prolonged time.
Wipe down the cooktop surface, take everything off the pads, and then see whether the code has gone.
Do not confuse it with
The same display can show code 5, an error found with the display itself, or code 6 for low voltage. A thermistor error appears as code 3 or code 2 instead.
Cooktop service in San Francisco
If code 4 stays after the surface is clean and clear, call (415) 223-7887 and bring up LG cooktop repair. Tell them the code, the model number and what you cleaned.
Model compatibility: LG reuses codes across series and model years, so 4 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Code 4 on an LG cooktop means metal objects or water have touched the touch pads for a prolonged time.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your LG appliance?
Book a specialist visit for a clear estimate and approval before any repair.
You submit a request with your appliance model and symptom, we confirm an appointment window, and a technician performs an on-site diagnosis. You then receive a clear estimate and decide whether to proceed before any repair begins.
Yes. We provide an upfront estimate after diagnosis. No parts are ordered or installed until you approve the work, so there are no surprise charges.
Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
Service areas are listed on the Locations page. Contact us with your ZIP code to confirm current coverage for your address.
Ready to get your LG appliance working again?
Book a repair online or call us — clear estimates and approval before any repair work begins.
