LG Gas Oven Igniter Replacement

Symptoms and What They Mean#

This guide covers LG gas ranges and ovens (LRG and LSG prefixes); electric LG ovens use a heating element instead.

How the Ignition Sequence Works#

Select a temperature and the board sends 120V to the igniter, which heats and glows bright orange, climbing past 2,500F. As it reaches full temperature its current draw rises, and the heat from the igniter trips the bi-metal gas safety valve mounted right beside it, releasing gas that the glowing element lights. The whole chain hinges on current: a healthy igniter pulls enough amperage to open the valve, and a degraded one does not, so the element glows but no gas flows.

Testing the Igniter#

The definitive test is amp draw. Set a multimeter to AC amps, connect it in series with one igniter lead, and turn on the oven — a good igniter reaches its rated draw within about a minute. If it falls short, replace it. Without an amp clamp, measure resistance instead: expect roughly 40 to 400 ohms, and an infinite reading means the element has cracked.

Replacing the Igniter Safely#

Shut off gas supply. Verify your gas shutoff valve location before starting any gas appliance repair. Then disconnect power, remove the oven racks and the oven-floor panel, and find the igniter mounted beside the burner tube at the bottom of the oven.

1. Disconnect the igniter wire connector, often reached behind the broil-burner area or from the back.
2. Remove the two mounting screws and slide the old igniter out.
3. Handle the new igniter by its ceramic base only — skin oils on the silicon-carbide element shorten its life.
4. Slide it into position beside the burner ports and secure the screws.
5. Reconnect the harness.
6. Turn the gas back on, restore power, set the oven to 350F, and watch it glow and light within about a minute. The flame should be blue with slight yellow tips.

A Phillips #2 and a 1/4-inch nut driver handle the panel and bracket, and an amp clamp makes the diagnosis certain.

Can a Weak Igniter Leak Gas#

No. The gas safety valve stays shut unless the igniter draws enough current, so a weak or dead igniter keeps the gas off rather than letting it escape. A gas smell from a non-heating oven is very rare and points to the valve, not the igniter — in that case shut off the gas immediately and call a professional.

Why the Amp Draw Decides It#

The reason a visibly glowing igniter can still fail is that ignition depends on current, not on light. The safety valve only opens when the igniter pulls enough amperage to heat the bi-metal strip beside it, and as the silicon carbide ages its draw slowly falls. Eventually it glows brightly but no longer reaches the current the valve needs, so gas never releases. That is why a visual check misleads and the amp-draw test is definitive: the element can look healthy while measuring well under the threshold that opens the valve.

Expected Lifespan#

LG gas oven igniters typically last 5-8 years, and heavy users may see 3-4, because the silicon carbide degrades a little with every heating cycle. Since the part is far cheaper than the gas valve and causes the vast majority of no-heat failures, it is the right first replacement whenever an LG gas oven stops heating.