Most gas fire pits that will not light have a tripped propane regulator, air in the gas line, or fire media buried over the burner ports. All three are free to fix at home in under ten minutes. Pressure, orifice and ignition-module faults come last: rarer, and work for a licensed gas technician.
What's on this page
- Symptom → cause table
- 1. Tripped excess-flow valve
- 2. Air in the gas line
- 3. Water or debris in the burner
- 4. Media buried over the ports
- 5. Dead igniter battery
- 6. Dirty thermocouple
- 7. Low pressure or small line
- 8. Wrong orifice after conversion
- 9. Failed module, pilot or valve
- Cost and DIY ranking
- Media depth by manufacturer
- FAQs
- Regulator reset
- 30 secWait before you relight
- Media above burner
- 1 in.The Outdoor Plus match-lit max
- Nominal inlet pressure
- 7" / 11" W.C.Natural gas / propane
- Purge cycle
- ~3 minThe Outdoor Plus 30VDC, repeat
If you smell gas, stop now. Do not run another ignition cycle. The Outdoor Plus match-lit manual is explicit: "If you smell gas: 1) shut off gas to appliance. 2) Extinguish any open flame. 3) If odor continues, keep away from appliance and immediately call gas supplier or fire department." A pit that has been clicking for two minutes holds a bowl of unburned gas. Close the gas supply valve, do not touch light switches or anything that can spark, and move away from the pit — make the call to your gas supplier, the fire department or a licensed gas technician from a safe distance, not standing over the burner. Do not attempt to light it again until the odor is completely gone and the cause has been found. If you ever smell gas indoors or inside an enclosure, leave first and call from outside.
Know where the homeowner line stops. Five things on this page are yours to do: resetting a tripped propane regulator, purging air by repeating ignition cycles, clearing water and debris from the burner, re-laying fire media, and changing an igniter battery. Four are not: gas piping and flex connectors, inlet pressure testing or regulator adjustment, orifice and fuel-conversion changes, and gas valve or pilot assembly replacement. Those are licensed work under the National Fuel Gas Code (ANSI Z223.1 / NFPA 54) and your local code, and the appliance itself must be installed by a licensed gas technician under the same code. Doing them yourself can void the listing, the warranty and your homeowner's insurance. Never test for a leak with a flame — use soapy water.
What does your fire pit do when you try to light it?
Start here. The exact noise and flame behavior narrows nine causes to one or two. Unordered troubleshooting lists are why people replace a gas valve when the real fault was a propane tank opened too fast.
| What you see and hear | Most likely cause | How to check | Fix |
|---|---|---|---|
| Clicks or sparks, no flame | Air in the line, or a closed key valve | Listen for gas hiss at the burner; trace every upstream valve | Repeat ignition cycles to purge; open the key valve slowly |
| Clicking, no visible spark | Dead igniter battery or shorted electrode wire | Pull the battery; watch whether the spark arcs to nearby metal | New alkaline cell; re-route the wire off metal |
| Dies ~30 seconds after you release the knob | Thermocouple not heating, or a starved pilot | Hold the knob a full 30 seconds; see if the pilot flame wraps the sensor tip | Clean the thermocouple with a soft brush; a starved pilot orifice is a technician job |
| Runs several minutes, then shuts down | Low pressure, weak pilot, or over-temperature trip | Manometer at the valve; check enclosure vents | Technician pressure test; clear the ventilation |
| Low, lazy flame on HIGH (propane) | Regulator excess-flow valve tripped | Flame does not respond when you turn it up | The 30-second reset below |
| Low, yellow, sooty flame | Media too deep, or blocked venturi / spider guard | Clear the media and look straight at the ports | Reduce depth; clean the spider guard |
| Flame on one side only | Ports plugged by water, insects or media fines | Pull all media; blow the ports out | Clear every port, re-lay media evenly |
| Gas smell, no flame | Gas flowing with no ignition, or a leak | Stop clicking | Shut off, ventilate, soapy-water leak test, call a technician |
| Whistling once lit | Kinked, undersized or elbow-heavy flex line | Trace the connector from valve to burner | Licensed technician re-routes or replaces the connector — do not reshape gas line yourself |
Compiled from the troubleshooting tables in The Outdoor Plus match-lit, Flame Sense and 30VDC manuals and the HPC Fire electronic ignition guide.
1. Did you open the propane tank valve too fast?
The most common propane complaint, and almost nobody names it right. Every OPD tank regulator holds an excess-flow safety device. Napoleon describes its job plainly: it detects "excess flow of propane, abnormal to usual flow" and cuts the gas released. Open the tank valve quickly and that rush looks like a ruptured hose, so the device latches into bypass and feeds a trickle. You get a weak flame that ignores the key valve, or no light at all. Nothing is broken.
- Burner control OFF, then close the tank valve.
- Disconnect the regulator coupling nut.
- Wait 30 seconds — up to five minutes if it has tripped before.
- Reconnect hand-tight to a positive stop.
- Open the tank valve slowly, a quarter turn at a time, until it stops.
- Brush soapy water on the reconnected coupling and watch for bubbles — never check with a flame. Bubbles mean stop and call a technician.
- Wait another 30 seconds, then light.
Prevent it: knobs off before you open the tank, knobs off before you close it. Propane-only — one more reason to read our natural gas versus propane comparison.
2. Is there still air in the gas line?
A line that was just installed, re-piped or reconnected to a fresh tank is full of air. The igniter sparks into nothing. Manufacturers treat this as expected. The Outdoor Plus match-lit table lists "Air in gas line New install - may take several attempts" as the first cause of a pilot that will not light, and the Flame Sense manual says "it may take several cycles to purge air from the lines."
The 30VDC manual gives the usable procedure: run the system roughly three minutes, cycle off and back on, repeat several times until gas flows consistently. Wait five minutes between attempts so unburned gas disperses. A 40-foot run of half-inch pipe holds far more air than a three-foot flex connector. If you are a dozen cycles in with no gas smell at all, it is not air — look upstream at a closed valve.
3. Is there water or debris sitting in the burner?
Every uncovered fire pit fills with rain. Water pools in the pan, wicks into the burner tube through the ports, and stays. A half-drowned burner lights on the dry side only, or not at all. HPC Fire lists an "obstructed fire ring" — water, debris, blockage — as a direct cause of a pilot that lights while the main burner does not. The Outdoor Plus says the same: "Confirm no water or debris in burner."
Gas off, pit cold. Scoop out all media, inspect the ports and pan drain, blow the ports clear with compressed air, and let it dry fully. Clean the mesh spider guard while you are there — The Outdoor Plus names a blocked spider guard as the cause of heavy soot, because wasps do nest in venturi tubes. A fitted cover ends the cycle; ours start at $67.65, less than one service call.
4. Is your fire glass or lava rock too deep?
The most common self-inflicted cause, because more media photographs better. Bury the burner and you smother it: a flame that lights then dies, a yellow sooty flame, or fire only in the gaps.
The numbers are not a matter of taste. The Outdoor Plus match-lit manual sets a hard ceiling — "No more than 1" of burning media above the height of the burner" — with decorative glass at just 1/8 to 1/4 inch over the burner. American Fyre Designs allows up to 2 inches. Size matters too: the 30VDC manual specifies pieces from 1/4 to 3 inches and tells propane users to avoid anything under 1/2 inch, since fines pack tight and choke the ports. Keep the pilot hood and ignition components clear. See fire glass versus lava rock for sizing.
Send us a photo of your burner
Not sure whether your media is too deep, or which pilot assembly you have? Clear the media, photograph the burner and send it over. We will identify the system and tell you what part you actually need. No purchase expected.
Send a photo to our team Find your manual5. When did you last change the igniter battery?
No sound and no spark from the push button? Check the battery before anything else. Spark igniters are not wired to the house; they run on a single cell that dies quietly, usually at the start of the season. The Outdoor Plus push-button igniter takes AAA batteries. Their Flame Sense system takes "a new AA battery," and the manual specifically recommends alkaline.
Three things fool people. A weak cell still clicks, but the spark is too soft to ignite — replace, do not judge by ear. A spark that lands in the wrong place means a misaligned electrode; The Outdoor Plus says the "Spark Igniter Must Be Correctly Aligned With Burner Holes." And a chafed wire touching the pan shorts the spark to ground. Battery ignition is convenience, not a safety system — compare match lit versus electronic ignition.
6. Is the thermocouple dirty or sitting outside the flame?
Signature symptom: the pilot burns while you hold the knob, then dies seconds after you let go. That is a thermocouple fault nearly every time. It has to get hot enough to generate the millivolts holding the safety valve open, and it is not getting there.
Cause one is technique. The Outdoor Plus says the thermocouple "must have time to heat up. Hold the knob in for 30 seconds." Most people hold five. Cause two is soot: The Outdoor Plus and HPC Fire both prescribe removing the media around the pilot, taking off the blowout box lid, and cleaning the sensor with a soft brush every six months. No sandpaper, no wire wheel. Cause three is a starved pilot — a dirty orifice makes a flame too small to envelop the tip. If a clean sensor and a full 30-second hold both fail, the thermocouple or valve is faulty — cleaning is yours, but replacing a thermocouple or touching the gas valve is licensed technician work.
7. Is the gas pressure or the line size too low?
Low pressure lights a flame that looks acceptable, then dies minutes later, or never reaches full height on HIGH. Published ranges differ by system, which is exactly why you check your own manual and not a forum post.
| Manual | Natural gas inlet | Liquid propane inlet |
|---|---|---|
| The Outdoor Plus — Match Lit Fire Pit Insert (2024) | 3.5" min / 7.0" W.C. max | 8.0" min / 11.0" W.C. max |
| The Outdoor Plus — Flame Sense (2024) | 6.0" min / 7.0" W.C. max | 8.0" min / 11.0" W.C. max |
| The Outdoor Plus — Low Voltage 30VDC (2025) | 3.5" min / 7" nom. / 14" W.C. max | 8" min / 11" nom. / 14" W.C. max |
| American Fyre Designs — fire table manual | 5" min / 10.5" W.C. max | 11" min / 13" W.C. max |
Nominal working values across the category are 7" W.C. natural gas and 11" W.C. propane. There is no single industry figure — use your model's manual.
Line sizing is the other half. A long half-inch run feeding a high-output burner holds pressure at rest and collapses under load, which reads as "it lights and then quits." Sizing follows BTU load, run length and elbow count — see how many BTUs your fire pit needs, then have a licensed technician run the numbers. Reading inlet pressure takes a manometer and is not a homeowner job.
8. Was this fire pit converted from natural gas to propane?
Orifices are drilled for one fuel. Propane carries far more energy per cubic foot than natural gas, so its orifice is markedly smaller. A natural gas orifice on propane gives a tall, soft, sooty, roaring flame. A propane orifice on natural gas gives the opposite: a thin flame that struggles to light and dies on its own.
Two tells: the data plate names one fuel while the supply is the other, or a previous owner mentions a "conversion kit." The Outdoor Plus 30VDC table lists verifying the "correct injector type (LP or NG)" as a direct cause of an igniter that fires but will not light. This is not a DIY repair — field conversion is only legitimate when the manufacturer publishes a kit for that exact model, and most fire pit burners are not field-convertible at all. Buy the fuel type you have; see our burner type comparison.
9. Has the ignition module, pilot or gas valve failed?
Last, because it is least likely and most expensive. On electronic systems the module usually tells you. HPC Fire publishes error codes: 1 is igniter failure, 3 a thermocouple error, 6 igniter open, 7 broken communication, 8 remote not paired.
Rule out the cheap faults it imitates. HPC Fire lists a tripped breaker, an off wall switch, dead remote batteries and a blown external fuse on the valve box as causes of a system with no response at all. Low-voltage systems need current: The Outdoor Plus 30VDC manual flags "insufficient electrical amperage" as a cause of full lockout and calls for more than 10.2VDC at the pilot valve — a reading a technician takes, not a homeowner. One failure mode gets misread constantly — a unit that detects flame then shuts down is usually overheating in an unvented enclosure, not a dead module. Confirm venting before ordering parts.
Which of these can you fix yourself?
| # | Cause | DIY or technician | What it costs you |
|---|---|---|---|
| 1 | Tripped propane excess-flow valve | DIY | $0 — ten minutes |
| 2 | Air in the gas line | DIY | $0 — repeat cycles |
| 3 | Water or debris in the burner | DIY | $0 to clear; covers from $67.65 |
| 4 | Media too deep or over the ports | DIY | $0 to re-lay; fire glass if short |
| 5 | Dead igniter battery | DIY | One alkaline AA or AAA |
| 6 | Dirty or misaligned thermocouple | DIY to clean, technician to replace | Soft brush; part price varies |
| 7 | Low pressure or undersized line | Licensed technician only | Manometer test plus any re-pipe |
| 8 | Wrong orifice after a conversion | Licensed technician only | Correct burner or valve assembly |
| 9 | Failed ignition module, pilot or valve | Technician | Highest of the nine — confirm first |
Prices are live Outdoor Heat Direct catalog prices. We publish no estimate for third-party service-call rates. The likelihood ranking is our own service experience, not a manufacturer statistic.
Read the order. Causes 1 through 5 are free or nearly free and cover most calls. Buying a replacement instead? Start with the 2026 fire pit buying guide.
How deep should fire media sit over the burner?
| Manual | Published media limit | Notes |
|---|---|---|
| The Outdoor Plus — Match Lit Insert (2024) | No more than 1" above burner height | Lava rock under 2" above the fire ring; glass 1/8–1/4" over the burner |
| The Outdoor Plus — Flame Sense (2024) | No more than 1" above burner height | No more than 2" total over the burner element |
| The Outdoor Plus — Low Voltage 30VDC (2025) | Media over the burner never to exceed 3" | Pieces 1/4–3"; propane users avoid under 1/2" |
| American Fyre Designs — fire table manual | Do not exceed 2" above the burner | Lava and glass alike; no media on the screen |
Quoted from the manuals listed in sources. Model not listed? Look it up in our manuals library rather than assuming.
Pull and rinse the media once a season, and keep it out of the pilot hood, electrode and burner drain. If your flame blows out in wind rather than failing to light, a wind guard solves a different problem than anything on this page.
When should you stop and call a licensed gas technician?
Stop for any of these: a gas smell that persists after the valve is closed, untraceable hissing, scorching on the enclosure, damaged wiring, or repeated self-shutdowns after flame is detected. HPC Fire says the same — stop operation and contact a certified technician. Gas piping, pressure adjustment, orifice changes and valve replacement fall under the National Fuel Gas Code, ANSI Z223.1 / NFPA 54. Local rules can be stricter; check fire pit regulations in your area and your clearances. If the unit sits in a tank enclosure, confirm the vents are clear — blocked vents cause both over-temperature shutdowns and propane accumulation.
Need the part, not the diagnosis?
Once you know what failed, we stock the replacements: stainless burners from $76, brass key valves from $44, and components for most current systems.
Shop burners Shop key valvesFrequently asked questions
Why does my fire pit click but not light?
Clicking means the igniter works and gas is not reaching the spark. Usual causes: air still in a new line, a closed key valve, or a tripped propane regulator. Purge by repeating ignition cycles, confirm every upstream valve is open, and reset the regulator. Stop immediately if you smell gas.
How do I reset the regulator on a propane fire pit?
Turn the burner control off, close the tank valve, and disconnect the regulator coupling nut. Wait 30 seconds so the excess-flow device reseats. Reconnect hand-tight to a positive stop, then open the tank valve slowly, a quarter turn at a time. Wait another 30 seconds before lighting.
Why does my fire pit go out after 30 seconds?
The thermocouple is not hot enough to hold the safety valve open. The Outdoor Plus manual says to hold the control knob in for a full 30 seconds so the sensor heats. If it still drops out, clean the thermocouple with a soft brush and check that the pilot flame wraps its tip.
Can rain stop a gas fire pit from lighting?
Yes. Water pools in the pan and wicks into the burner tube through the ports, so the burner lights unevenly or not at all. Clear all media, blow the ports out with compressed air, and let everything dry completely before relighting. A fitted cover prevents the whole problem.
How much fire glass should cover the burner?
Less than most people use. The Outdoor Plus match-lit manual allows no more than 1 inch of media above burner height, with decorative glass at 1/8 to 1/4 inch directly over the burner. American Fyre Designs permits up to 2 inches. Published limits differ, so check your own manual.
Why is my propane fire pit flame so low?
On propane, a low flame that ignores the key valve almost always means the regulator's excess-flow valve tripped because the tank valve opened too quickly. Reset it. If the flame is low, yellow and sooty rather than simply small, the cause is media depth or a blocked spider guard instead.
What battery does a fire pit igniter take?
It depends on the system. The Outdoor Plus push-button spark igniter uses AAA batteries; their Flame Sense system uses a single AA, and the manual specifically recommends alkaline. A weak cell still clicks but produces a spark too soft to ignite, so replace it rather than testing it by ear.
My fire pit only lights on one side. What is wrong?
Ports on the dark side are blocked, typically by water, media fines packed into the holes, or an insect nest in the venturi. Shut off the gas, let it cool, remove all media, and blow every port clear with compressed air. Clean the mesh spider guard at the same time.
I smell gas but it will not light. What should I do?
Shut off the gas at the appliance, extinguish any open flame, and stop attempting ignition. Let the area clear in open air for at least five minutes. If the odor persists after the valve is closed, leave the area and call your gas supplier or the fire department, as manufacturer instructions direct.
When do I need a licensed gas technician instead of fixing it myself?
Any time the work touches gas piping, inlet pressure, orifices or the gas valve itself. Reading pressure requires a manometer, and a wrong orifice makes the appliance unlisted. Cleaning, media, batteries and regulator resets are homeowner tasks; everything past the valve inlet is not.
Sources and accuracy note. Pressure figures, media limits, purge guidance, battery types and troubleshooting language are quoted from manufacturer documentation: The Outdoor Plus Match Lit Fire Pit Insert Manual (2024), Match Lit with Flame Sense Installation and Operation Guide, Flame Sense Ignition Installation Manual (2024), Spark Igniter Push Button Manual (2024) and Low Voltage Ignition System Manual 30VDC; the American Fyre Designs fire table installation and owner's manual; and the HPC Fire electronic ignition troubleshooting guide. The excess-flow reset sequence follows published propane appliance guidance from Napoleon and Nexgrill.
The ordering of the nine causes by likelihood is Outdoor Heat Direct's own service experience, not a published statistic. Prices are live catalog prices at the time of review and change without notice. We cannot confirm a single industry-wide media depth or inlet pressure figure because manufacturers publish different values — use the manual for your exact model. Gas piping, pressure adjustment, orifice changes and gas valve work must be performed by a licensed gas professional under the National Fuel Gas Code, ANSI Z223.1 / NFPA 54, and all local codes.