Gas grill will not light: a step-by-step fix
Cooking
Photo: Canary Vista ES / Pexels A grill that refuses to light on the first warm evening of the season is a familiar problem, and it is rarely something expensive. The causes cluster around the regulator safety, the igniter, and blocked burner tubes. Work through them in this order and you will find it, usually in under half an hour.
Reset the regulator bypass first
Propane regulators contain an excess flow device that trips if it senses a sudden gas rush, which happens when you open the tank valve with burner knobs on. Once tripped, you get a tiny flame or none at all. To reset: turn all burner knobs off, close the tank valve, disconnect the hose, wait a full minute, reconnect, then open the tank valve slowly before turning any knob on.
Verify you actually have fuel
Tank gauges are unreliable. Pour a cup of hot tap water down the side of the tank and feel it with your hand. The level where the metal turns cool marks the liquid propane inside. A tank that feels uniformly warm is empty. In cold weather a nearly empty tank also struggles to vaporize enough gas to sustain a flame.
Test the igniter
In low light, remove the cooking grates and heat shields, then press the igniter and look for a spark jumping from the electrode to the burner tube. No spark on a push-button model usually means a dead AA battery, which people overlook constantly. On piezo models there is no battery, so a dead unit means a cracked electrode or a broken wire. Igniter kits run $20 to $50.
Clear the burner tubes
Spiders and wasps build nests inside burner venturi tubes, and this is one of the most common grill problems there is. Remove the burners and run a purpose-made venturi brush or a stiff bottle brush through each tube. Then clear the small ports along the burner with a paperclip. Blocked tubes cause weak flames, uneven burners, and flames burning back near the valve.
Look at the flame, not just the ignition
Once lit, the flames should be blue with small yellow tips, standing an inch or so tall and even across the burner. Large yellow lazy flames mean poor air mixing from a blocked venturi or a misadjusted air shutter. Flames that lift off the ports point to too much gas pressure or a regulator problem worth replacing.
Hoses, regulators, and when to replace
Regulators and hoses are wear items. Cracked, stiff, or chewed hoses should be replaced, not taped, and a complete hose and regulator assembly is $25 to $60. Check for leaks by brushing soapy water on connections with the tank open and burners off, then watching for growing bubbles. Never test with a flame.
Safety limits on grill DIY
Cleaning burners, replacing igniters, and swapping a complete hose and regulator assembly are reasonable homeowner tasks. Modifying orifices, converting a grill between propane and natural gas without the manufacturer kit, or repairing a leaking valve manifold are not. Improper conversions are a leading cause of grill fires.
Frequently asked questions
Why does my grill only reach 300 degrees?
Almost always a tripped regulator bypass or partially blocked burner tubes. Do the regulator reset first, then clean the venturis.
Can I light my grill with a match if the igniter is broken?
Yes. Open the lid, turn on one burner, and use a long match or lighter at the match-light hole. Never light with the lid closed, since gas accumulates.
How often should I clean grill burners?
Inspect and brush the burner tubes twice per grilling season, and always at the first use of spring when nests are most likely.