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Error code reference

LG Oven Error Code F-19

Lower oven does not heat

LG codesLG oven codes

Lower oven does not heat — oven temperature does not exceed 150°F/66°C in less than 5 minutes.

First step from the service manual

Check thermostat open/short between DLB Relay L2 connections; check electric wiring and heater resistance.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F-19 means on a LG oven

The F-19 error code on an LG oven indicates that the lower oven cavity is failing to reach a minimum temperature threshold. Specifically, the control board detects that the lower oven temperature has not exceeded 150°F (66°C) within a 5-minute window after a bake or broil cycle is initiated. This tells the control system that either no meaningful heat is being generated or that the heat output is severely insufficient, and the code is triggered as a safety and performance fault.

The diagnostic focus for F-19 centers on the DLB (Double Line Break) relay and its L2 connections, the bake or broil heating element, and the associated wiring harness. The DLB relay is a safety relay that interrupts both legs of the 240V circuit to the lower oven heater. If this relay has an open or short condition on the L2 side, the heater will not receive proper voltage, resulting in no heat or severely reduced output. Technicians should measure resistance across the relay contacts and verify continuity through the wiring from the relay to the element terminals.

The lower oven heating element itself is a frequent culprit. A failed element will show an open circuit when measured with a multimeter, typically reading infinite resistance rather than the expected low resistance value in the range of 20 to 50 ohms depending on element wattage. Damaged wiring connections, burnt terminal blocks, or a faulty relay on the control board can all produce the same symptom. A thorough inspection of all wiring between the relay, the terminal block, and the element is essential before replacing components.

Source: manufacturer service documentation.

Common causes of F-19

  1. 01

    Failed lower oven heating element

    Part replacement

    The bake element has burned out or broken, preventing it from generating heat. A visual inspection may reveal a crack or burn spot, and a multimeter will show an open circuit (infinite resistance) across the element terminals.

  2. 02

    DLB relay open or short on L2 connections

    Part replacement

    The Double Line Break relay that controls power delivery to the lower heater may have failed internally or developed a faulty connection at its L2 terminals. This interrupts one or both legs of the 240V supply to the element, leaving the heater without adequate voltage.

  3. 03

    Damaged or burnt wiring harness

    Part replacement

    High heat inside the oven cavity can degrade the insulation on wiring connecting the relay to the heating element. Look for burnt, melted, or disconnected wires at the terminal block and element connectors.

  4. 04

    Loose or corroded terminal connections

    Wiring / connection

    Connections at the element terminals or relay contacts can loosen or corrode over time, creating high resistance or an open circuit. Inspect all connectors for discoloration, oxidation, or physical looseness and reseat or replace them as needed.

  5. 05

    Faulty control board relay circuit

    Part replacement

    If the relay driving the lower oven circuit is integrated into or controlled by the main control board and has failed, the board may not be sending the proper signal or switching voltage to energize the heater. This is typically diagnosed after ruling out the element, wiring, and standalone relay.

See the test procedure for each cause

Frequently asked questions about F-19

What does F-19 mean on a LG oven?
The F-19 code means the lower oven is not heating properly. The control board monitors whether the lower cavity temperature rises above 150°F (66°C) within 5 minutes of starting a cycle, and if it does not, F-19 is triggered. The fault points to a problem in the lower oven heating circuit, which can include the heating element, the DLB relay, or the connecting wiring.
Can I fix the F-19 error myself?
Some steps are within reach for a confident DIYer, such as visually inspecting the lower heating element for visible damage or checking for loose terminal connections. However, diagnosing the DLB relay and testing wiring resistance requires a multimeter and working around 240V circuits, which carries a serious shock risk. Always disconnect power at the breaker before inspecting internal components, and consider calling a qualified technician if you are not comfortable with electrical diagnostics.
Is it safe to use my LG oven while it shows F-19?
No, you should not attempt to use the oven while this error is active. The lower oven is not heating to a safe or functional temperature, meaning food will not cook properly. More importantly, a fault in the relay or wiring could pose an electrical hazard. Stop using the oven and address the fault before resuming normal operation.
Will resetting the oven clear the F-19 code?
Resetting the oven by cutting power at the breaker for a few minutes may temporarily clear the F-19 code, but if the underlying component failure is still present, the code will return as soon as the oven attempts to heat again. A reset alone is not a repair. The heating element, relay, and wiring must be diagnosed and any failed parts replaced to permanently resolve the fault.
How much does it cost to repair an LG oven F-19 error?
Repair costs vary depending on which component has failed. A replacement lower bake element typically ranges from $30 to $100 for the part itself, while a control board or relay replacement can cost considerably more. Adding professional labor, total repair costs can range from $150 to $400 or more depending on your location and the specific parts required. Getting a diagnostic service call first can help you determine whether repair or replacement makes more financial sense.

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