LG Oven Error Code H-3

H-3 on an LG oven means the control system detected a fault with the lower bake heater circuit during its self-diagnosis routine. The oven was unable to confirm that the lower bake element and its associated wiring are functioning correctly. This error prevents normal baking operation until the underlying issue is identified and corrected.

No, you should not attempt to use the oven while H-3 is active. The error indicates a fault in the lower heating circuit, which means the oven may not heat correctly or at all, and an undiagnosed wiring or element problem can pose a risk of further damage or a potential electrical hazard. Leave the oven off until the fault is diagnosed and repaired.

Resetting the oven by cycling the power at the breaker may temporarily clear the H-3 code, but it will return if the underlying fault is still present. Because H-3 is triggered by the oven's self-diagnosis routine, the code will reappear as soon as the oven runs that check again. A permanent fix requires identifying and correcting the actual fault in the lower bake heater circuit.

Some causes of H-3 are within reach of a knowledgeable DIYer. Checking and reseating the wire connectors at terminals T206 and T207 on the Wall Main PCB requires only basic tools and no special skills. However, testing and replacing the bake element or wiring harness involves working near high-voltage components, and board replacement requires careful handling. If you are not comfortable working with electrical components inside an oven, a qualified technician is the safer choice.

Repair costs depend on the root cause. If only a loose connector needs reseating, there may be no parts cost at all, though a service call typically runs between $75 and $150. A replacement lower bake element generally costs between $25 and $80 for the part itself. If the Wall Main PCB requires replacement, parts and labor combined can range from $200 to $400 or more depending on the model and labor rates in your area.