Had a call last month from a caterer in Beaumont running an SPK-700/M. Said his burners wouldn't light consistently — sometimes fired right up, sometimes nothing. He'd already replaced the igniter twice. Wasn't the igniter.
That's the thing about gas-assist burner problems. Operators tend to chase the obvious component first and miss what's actually happening. I've been working on these units for going on three decades now, and I can tell you most burner issues aren't complicated. But they do require you to actually understand the ignition sequence and what each part is supposed to do.
Start With the Basics Before You Start Pulling Parts
Before you touch anything, check your gas supply. I know that sounds obvious. You'd be amazed how many service calls I've taken where the LP tank was at 15% or the natural gas shutoff upstream got bumped. Takes thirty seconds to verify. Do it first.
On Southern Pride gas-assist models — your SPK-500/M, SPK-700/M, SPK-1400, the SP series, the MLR units — the gas system is there to supplement wood combustion, maintain holding temps, and give you consistent heat when you need it. It's not the primary heat source the way it would be on a gas-only oven. That means when operators see flame issues, they sometimes assume it's a wood management problem when it's actually burner-related, or vice versa.
If your unit has been running fine for months and suddenly won't ignite, that's a different diagnostic path than intermittent problems that have been getting worse over time. Sudden failures usually point to a single component. Gradual degradation means something's wearing out or fouling up.
The Ignition Sequence: What Should Happen
When you call for heat on a Southern Pride gas-assist unit, here's the sequence:
The control board sends power to the igniter. The igniter heats up — on most units this is a hot surface igniter, not a spark type. Once the igniter reaches temperature (usually takes 15-30 seconds depending on model), the gas valve opens. Gas flows to the burner, hits the hot igniter, and you get flame. The flame sensor then confirms ignition and tells the control board to keep the gas valve open.
If any step in that sequence breaks down, you don't get fire. And the unit should lock out for safety after a few failed attempts.
Igniter Problems: Not Always What You Think
Hot surface igniters do wear out. They're consumable parts, realistically need replacement every 2-4 years in heavy commercial use. But here's where operators waste money: they see no ignition and immediately order a new igniter when the actual problem is the igniter isn't getting power.
Check voltage at the igniter terminals first. Should see somewhere around 120V when the control board is calling for ignition. No voltage means the problem is upstream — could be the control board, could be a limit switch that's tripped, could be a loose connection at the wiring harness.
If you've got voltage but the igniter isn't glowing, then yeah, the igniter is probably shot. They crack. The element oxidizes and fails. Normal wear. But I've also seen igniters that glow orange instead of bright white-orange — that's an igniter on its way out. It's heating up, just not hot enough to reliably ignite gas. Replace it before it strands you mid-service.
The Beaumont caterer I mentioned? His igniter was fine. His igniter was getting power. But his gas valve was sticking intermittently because grease had migrated into the valve body over about four years of heavy use without proper cleaning around the burner area.
Gas Valve Issues
The gas valve on Southern Pride units is a safety-rated component. It's normally closed — meaning it only opens when the control board energizes it, and only stays open while the flame sensor confirms combustion. If the valve doesn't open, or opens partially, or opens late, you get ignition failures.
Partial valve opening gives you a weak flame that might not reach the flame sensor properly. Late opening means the igniter might start cooling before gas arrives. Complete failure to open means nothing happens at all.
You can test the valve with a multimeter. Check for 24V at the valve terminals when the board is calling for ignition. If you've got voltage and the valve doesn't click open, the valve is bad. If you don't have voltage, trace it back to the board.
I don't recommend operators try to clean or rebuild gas valves. Replace them. A rebuilt valve that fails during a 400-brisket weekend isn't worth the $80 you saved. We keep valves in stock at Southern Pride of Texas for exactly this reason — I've had operators call me at 6 AM needing overnight shipping because they're catering a rodeo cook-off Saturday morning.
Flame Sensor: The Part Everyone Forgets
The flame sensor is a small rod that sits in the flame path. It detects ionization from the combustion process and sends a microamp signal back to the control board. That signal tells the board "yes, we have flame, keep the gas valve open."
If the flame sensor is fouled with carbon or oxidation, it can't sense the flame properly. The board sees no flame signal, assumes ignition failed, and shuts the gas valve. You end up with a unit that lights briefly — maybe half a second, maybe two seconds — then shuts off. Over and over.
Cleaning a flame sensor is simple. Pull it out, hit it with fine emery cloth or a Scotch-Brite pad, reinstall. Takes five minutes. Should be part of your monthly maintenance.
But here's what I see operators miss: flame sensor positioning. If the sensor gets bumped during cleaning or someone reinstalls it at a slightly wrong angle, it might be outside the flame envelope. Flame is present but the sensor isn't in it. Same symptom — lights briefly, then cuts out. Check positioning if cleaning doesn't solve the problem.
When the Unit Locks Out
After multiple failed ignition attempts, Southern Pride units lock out. This is a safety feature, not a malfunction. The board tried, couldn't confirm flame, and decided to stop dumping gas into the firebox.
To reset a lockout, you typically need to cycle power to the unit or use the reset procedure in your manual. But don't just keep resetting and retrying. If it locked out twice, something is actually wrong. Find the problem.
Repeated lockouts without diagnosis can actually damage components. Every failed ignition attempt puts thermal stress on the igniter. You're filling the firebox with unburned gas that then ignites suddenly when you finally get a spark. Not good for the unit. Not safe for the operator.
Flame Pattern Problems
Sometimes the burner ignites fine but the flame looks wrong. Yellow and lazy instead of blue with defined cones. Flame lifting off the burner ports. Flame concentrated on one side. Delayed ignition with a soft "whump" sound.
Yellow lazy flames usually mean insufficient air. Check your air shutter adjustment. Could also be a partially blocked burner — grease, debris, spider webs (I've seen it happen when units sit idle for a few weeks). Pull the burner, clean the ports, reinstall.
Lifting flames mean too much primary air. Back off the shutter.
Delayed ignition with that soft explosion sound means gas is pooling before ignition. Check igniter position relative to the burner port — should be right at the port, not an inch away. Also check for drafts or airflow patterns that might blow gas away from the igniter before ignition.
Parts Quality Matters Here
I'll say this plainly: don't buy off-brand replacement parts for your gas components. I've seen generic igniters that were specced wrong for the application. I've seen aftermarket gas valves with flow rates that didn't match OEM. On a piece of equipment where you're running 600-800 pounds of meat, the $30 you save on a questionable igniter is absurd.
Southern Pride manufactures in the US and stocks parts domestically. That matters when you need a gas valve Tuesday, not in three weeks from some overseas distributor. We stock the common maintenance parts at Southern Pride of Texas because we know what fails and when. Igniters, flame sensors, valves, high-limit switches — the stuff you actually need for gas system service.
Compare that to some of the import smokers where getting a replacement gas valve means calling a distributor who calls an importer who puts in an order to China. I had a guy running an imported rotisserie unit who waited eleven weeks for a gas valve. Eleven weeks. He was running electric space heaters inside the cabinet to maintain temp. That's not a solution.
Know When to Call Someone
If you're comfortable with basic electrical testing and you understand the ignition sequence, you can diagnose most burner problems yourself. Replace igniters, clean flame sensors, check connections — that's operator-level maintenance.
But if you're seeing control board issues, intermittent problems that don't make sense, or anything involving the gas supply piping, get a qualified technician. Gas work requires appropriate licensing in most jurisdictions, and your insurance carrier will have opinions about who does what on commercial gas equipment.
The goal is keeping your Southern Pride unit running for another decade-plus. I've got SP-1000 units still in service that went into kitchens in the late 90s. They're still cooking because operators maintained them properly and didn't ignore small problems until they became big ones. Burner issues are almost always fixable — if you catch them before something cracks or burns out completely.
Resources: Southern Pride of Texas parts and support | Southern Pride | NFPA commercial kitchen standards
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Photo by Gustavo Fring on Pexels.
About the Author: Earl has been competing in sanctioned BBQ events since the early 1990s and operates a commercial catering operation in Southeast Texas.