LG error code F19: A control relay on the electronic oven control board is not in the expected state. This can mean a relay is stuck open (no heat) or stuck closed (continuous heat — dangerous).
A control relay on the electronic oven control board is not in the expected state. This can mean a relay is stuck open (no heat) or stuck closed (continuous heat — dangerous).
Unplug the appliance from the wall for 60 seconds, then plug back in. Some control board errors are transient and clear after a full power reset. If the error returns, continue diagnostics.
Use a multimeter to verify the outlet provides the correct voltage — 120V for most appliances, 240V for electric dryers and ranges. Low or fluctuating voltage can cause control board faults.
Tools needed: Multimeter
Disconnect power and remove the control board (usually behind the control panel or in the back service panel). Look for burnt components, swollen capacitors, scorch marks, or corroded solder joints.
Tools needed: Screwdriver set
Trace each connector on the control board and firmly press each one home. Loose connectors are a very common cause of intermittent board errors. Look for chafed or burned wires near connector bodies.
Before replacing the board, confirm all sensors (thermistors, pressure sensors, door switches) connected to it test within spec. A bad sensor can overload an output on the board and appear as a board failure.
Tools needed: Multimeter
Order the exact OEM control board for your model number. Photograph all wiring connections before disconnecting them. Transfer connectors one at a time to avoid wiring errors.
Tools needed: Screwdriver set, Smartphone (for photos)