Does My Furnace Have a Pilot Light? (And What to Do If It's Out)

Every October in the Oklahoma City metro, the same scene plays out in hundreds of homes: the first genuinely cold morning arrives, someone flips the thermostat over to heat for the first time since spring, and… nothing. Cold air, or no air. And one of the first questions people ask us on that call is a good one — “Doesn’t my furnace have a pilot light? Do I just need to relight it?”

Maybe. It depends entirely on how old your furnace is. Here’s how to tell what you’ve got, and what a “no heat” situation means in each case.

The short answer: it depends on your furnace’s age

There are two ways a gas furnace lights its burners, and which one you have decides everything:

• Standing pilot light. Older furnaces keep a small gas flame burning continuously inside the unit. When the thermostat calls for heat, that ever-present pilot flame lights the main burners. If the pilot goes out, the furnace has nothing to light with — so you get no heat.
• Electronic ignition. Furnaces made in roughly the last two to two-and-a-half decades skipped the constant flame entirely. Instead they use either a hot surface igniter (a small element that glows red-hot on demand) or an intermittent spark to light the burners only when heat is actually needed. There is no pilot light to go out, relight, or look for.

So if your furnace is newer, the honest answer is: you don’t have a pilot light, and there’s nothing to relight. That’s usually good news — standing pilots waste a trickle of gas year-round and are one more thing to fail — but it also means a no-heat problem is an ignition-system issue for a pro to diagnose, not a quick match-lighting fix.

How to tell which kind you have

You don’t need to be a technician to figure this out:

• Check the age. If your furnace was installed before about 2000, a standing pilot is likely. Newer than that, almost certainly electronic ignition.
• Look for a gas control knob. Standing-pilot furnaces have a gas valve with a dial that reads OFF / PILOT / ON and often a red reset button. Electronic-ignition furnaces don’t.
• Look through the access panel. With an older unit, you can often see a small, steady blue flame burning even when the furnace isn’t actively heating. No little flame and no PILOT setting? You’ve got electronic ignition.
• Read the label. Many furnaces have lighting or ignition instructions printed right on a sticker inside the access door — that sticker will tell you plainly whether there’s a pilot to light.

If you have a standing pilot and it’s out

A pilot can blow out over the summer or after a draft, and relighting it is one of the few furnace tasks a careful homeowner can reasonably do — if you follow the directions printed on your specific unit. The general sequence looks like this:

1. Set the thermostat to its lowest setting so the furnace won’t try to fire while you work.
2. Turn the gas control knob to OFF and wait a full five minutes for any lingering gas to clear. This step matters — don’t rush it.
3. Smell the air near the floor by the furnace. Gas is heavier than air and settles low. If you smell gas, stop right here, leave the house, and call from outside. Do not keep going.
4. If there’s no gas smell, turn the knob to PILOT, press and hold it in (or hold the reset button), and light the pilot with a long lighter at the pilot tube.
5. Keep holding for 30 to 60 seconds after the pilot catches, then release. Holding it lets the thermocouple heat up and signal the valve to keep the gas flowing.
6. Turn the knob to ON and set the thermostat back where you want it.

If the pilot lights and stays lit, you’re back in business. If it lights but dies the moment you let go — or keeps going out over the next day or two — don’t keep fighting it.

When a pilot that won’t stay lit means a bigger problem

A pilot that refuses to stay lit is almost always telling you something. The most common reason is a worn-out or dirty thermocouple — the little sensor that sits in the pilot flame. Its whole job is to confirm “yes, there’s a flame here” so the gas valve stays open. When it fails, the valve does exactly what it’s designed to do and shuts the gas off as a safety measure, killing the pilot. A drafty burner compartment, a partly clogged pilot orifice, or a tired gas valve can cause the same stubborn pattern.

None of those are things to keep band-aiding with repeated relights. A furnace that won’t hold its pilot is running on a safety system that’s doing its job — and the right move is to have the thermocouple or valve checked and replaced. On a furnace old enough to still use a standing pilot, it’s also worth an honest conversation about the system’s remaining life, since many of these units are well past 20 years old. A technician can test the ignition components and inspect the furnace repair basics — heat exchanger, flame, safety controls — in one visit so you’re not nursing it through the winter one match at a time.

A word on Oklahoma’s fall timing

This is exactly the season for it. Our autumns swing hard — 80 degrees one afternoon, a frost warning two mornings later — so your furnace often sits idle for months and then gets asked to work on short notice. A pilot that quietly went out in September, a thermocouple that was already weak last spring, or an electronic igniter nearing the end of its life tends to reveal itself on that first cold snap. Catching it in mild October weather is a lot more comfortable than discovering it during the season’s first hard freeze.

The bottom line

Whether your furnace has a pilot light comes down to its age: older units keep a standing pilot you can sometimes relight yourself, while anything built in the last couple of decades uses electronic ignition and has no pilot at all. Relighting a standing pilot by the printed instructions is fair game — but if it won’t stay lit, or if you’ve got a newer furnace that simply won’t fire, that’s a diagnosis, not a do-over. And if you ever smell gas, skip all of it and get out first.

Graco handles furnace repairs, no-heat calls, and fall tune-ups across Edmond, Oklahoma City, and the surrounding metro, with flat-rate pricing you approve up front before any work begins. Call (405) 500-5333 and we’ll get your heat going before the real cold sets in.