How to relight a furnace pilot light safely

To relight a furnace pilot light safely, turn the gas valve to Off, wait five minutes for residual gas to clear, then hold the reset button down while you light the pilot with a long-stem lighter. Keep holding for 30 seconds after the flame catches, release, and turn the valve to On. If the flame won't stay lit after two attempts, stop and call a professional - a pilot that keeps dying usually points to a thermocouple, dirty orifice, or draft problem that needs a technician's eyes.

We're Lima Furnace Repair Pros, and we've walked hundreds of Lima homeowners through this exact procedure. The rest of this post covers what a pilot light actually does, the safety checks that matter, the full step-by-step, and the reasons a pilot keeps going out - so you can decide whether to DIY or hand it off.

What a pilot light does and why it goes out

A furnace pilot light is a small, continuously burning flame that ignites the main gas burner when your thermostat calls for heat. On older standing-pilot furnaces - common in Lima's pre-1990 housing stock - that flame burns 24/7, consuming roughly $8-$15 a month in natural gas at 2026 rates.

Pilots go out for a short list of reasons. A draft from a nearby window or a cracked heat exchanger can snuff the flame. A dirty pilot orifice - often after summer, when dust settles in an idle furnace - restricts gas flow. A worn thermocouple stops generating the millivolt signal that tells the gas valve "the pilot is lit, keep the gas flowing." And low gas pressure, sometimes after a utility interruption, kills the flame outright.

If your furnace uses electronic ignition instead of a standing pilot, you won't find a pilot flame at all. Those units use a hot surface igniter or spark ignition, and a no-heat call on one of those is a different diagnosis. Our furnace ignition repair Lima OH team handles both styles.

Safety first: what to check before you touch anything

Before you kneel down in front of the furnace, confirm three things: you smell no gas, the area around the unit is clear of anything flammable, and you have a long-stem lighter or a match holder - never a standard cigarette lighter, which puts your hand too close to the burner.

If you smell gas - that rotten-egg odor - do not flip a switch, do not use your phone near the unit, and do not try to relight anything. Leave the house, and call your gas utility's emergency line from outside. That's a hard stop.

Here's the pre-flight checklist we run through on every pilot call:

• Shut off the furnace's electrical switch (usually a toggle on or near the unit) and the gas valve.
• Open a nearby window or door for ventilation.
• Confirm the pilot tube and burner area are free of dust, cobwebs, or debris.
• Have a flashlight handy - pilot assemblies are dark and small.
• Locate the gas control valve, the reset button, and the pilot tube before you start.

One more thing: if your furnace sits in a closet or a tight utility room, give yourself room to work. We see a lot of Lima homes where the water heater and furnace share a closet, and a cramped workspace is how people knock the pilot tube loose without realizing it.

How do I relight my furnace pilot light in Lima OH?

You relight a Lima furnace pilot by setting the gas valve to Pilot, pressing and holding the reset button, lighting the pilot flame, holding for 30 seconds, then turning the valve to On. The whole procedure takes about five minutes if the pilot assembly is clean and the thermocouple is healthy.

The exact steps vary slightly by brand. A Carrier furnace repair Lima OH call, for example, often involves a pilot assembly with a red reset button on the gas valve, while some older Trane furnace repair Lima Ohio units use a separate piezo igniter button. If you can't find the reset button, check the owner's manual or the label inside the burner door - it's usually printed there.

If you'd rather not crawl around a gas appliance, that's a reasonable call. Our furnace pilot light repair Lima OH techs relight pilots and inspect the assembly in the same visit, usually for a flat diagnostic fee.

Step-by-step: relight your furnace pilot light safely

Follow this order exactly. Skipping the wait step is the most common cause of a small flare-up when the burner finally catches.

1. Turn the thermostat to Off. You don't want the main burner firing while you're working on the pilot.
2. Set the gas control valve to Off. It's usually a round knob on the front of the gas valve with Off, Pilot, and On positions.
3. Wait five minutes. This lets any residual gas in the combustion chamber dissipate. Don't shortcut this.
4. Set the valve to Pilot. Push the knob in slightly and rotate it to the Pilot position.
5. Press and hold the reset button. On most units, this is the same knob you just turned - press it inward and hold.
6. Light the pilot. Hold a long-stem lighter next to the pilot tube opening. The flame should catch within 5-10 seconds.
7. Keep holding for 30 seconds. This lets the thermocouple heat up enough to hold the gas valve open on its own.
8. Release the reset button. If the pilot stays lit, turn the valve to On. If it goes out, wait five more minutes and try once more.
9. Turn the thermostat back on. The main burner should fire within a minute or two.

If the pilot lights but the main burner never fires, the problem is downstream of the pilot - a thermostat, control board, or gas valve issue. That's a job for a technician. Our furnace not turning on Lima OH page covers the common causes.

Why does my furnace pilot light keep going out in Lima Ohio?

A pilot that keeps going out in Lima is almost always a thermocouple, a dirty pilot orifice, or a draft issue - in that order. Thermocouples are the single most common culprit, and they're a $15-$40 part that takes about 30 minutes to replace.

Lima's housing stock matters here. A lot of homes around the South Main Street corridor and the older neighborhoods near Lima Senior High were built between 1920 and 1960, and many still run standing-pilot furnaces with original or once-replaced thermocouples. Cold snaps - and we get plenty of single-digit nights between December and February - stress those components, and that's when the pilot failures cluster.

Other repeat-offenders we see:

• Dirty pilot orifice. Dust and rust flakes restrict gas flow. Cleaning takes 15 minutes with the right brush.
• Draft from a return-air leak. A nearby return duct pulling air across the pilot can blow it out. Common in basements with unsealed ductwork.
• Failing gas valve. When the valve itself won't hold the pilot signal, replacement is the fix - typically $250-$450 installed in 2026.
• High-limit switch tripping. If the furnace overheats, the limit switch cuts gas to the burner and sometimes the pilot. Our furnace limit switch repair Lima OH team sees this most often on furnaces with clogged filters.

If your pilot has gone out three or more times in a single heating season, stop relighting it and get the assembly inspected. Repeated relights mask a component that's about to fail completely - usually on the coldest night of the year.

Common mistakes to avoid

The biggest mistake is skipping the five-minute wait. Residual gas in the chamber can ignite with a small pop or, in a worst-case scenario, a flash that singes eyebrows and startles you into dropping the lighter.

Other mistakes we see homeowners make:

• Using a standard cigarette lighter. Your hand ends up inches from the burner. Use a long-stem lighter or a match in a holder.
• Holding the reset button for only 5-10 seconds. The thermocouple needs a full 30 seconds to generate enough millivolts to hold the valve open.
• Relighting without cleaning the pilot tube. If the orifice is partially blocked, the flame will be weak and yellow instead of a crisp blue - and it'll go out again within days.
• Forcing a knob that won't turn. If the gas valve knob won't rotate to Pilot, the valve is likely seized. Stop and call us.
• Ignoring a yellow flame. A healthy pilot flame is blue with a slight yellow tip. A mostly yellow flame means incomplete combustion - a carbon monoxide risk.

If you ever see soot around the pilot assembly or smell something acrid near the furnace, shut it down and call a technician. Those are combustion problems, not pilot problems.

When to call a professional

Call a professional if the pilot won't stay lit after two attempts, if you smell gas at any point, if the flame is yellow or sooty, or if the pilot has gone out more than twice in one season. Those four scenarios cover about 90% of the pilot calls we run in Lima.

We handle pilot relights, thermocouple replacements, pilot assembly cleanings, and full gas valve swaps. If your furnace is on its last legs and you're weighing repair versus replacement, we'll tell you straight - no pressure either way. We also stock common thermocouples and pilot assemblies on our trucks, so most pilot repairs are done in a single visit.

For homeowners in the neighborhoods around UNOH and the Bath Township line, we're usually on-site within a couple of hours during heating season. Same-day service is standard when you call before early afternoon.

Frequently Asked Questions

How do I relight my furnace pilot light in Lima OH?

Turn the gas valve to Off, wait five minutes, set it to Pilot, hold the reset button, and light the pilot with a long-stem lighter. Hold for 30 seconds after the flame catches, release, then turn the valve to On. If it won't stay lit after two tries, call a technician.

Is it safe to relight a furnace pilot light in Lima?

Yes, if you smell no gas and follow the five-minute wait step. The procedure is safe for a homeowner with a long-stem lighter and basic patience. Stop immediately if you smell gas, see a yellow flame, or the pilot won't stay lit after two attempts.

Why does my furnace pilot light keep going out in Lima Ohio?

The three most common causes are a worn thermocouple ($15-$40 part), a dirty pilot orifice, and drafts from leaky return ducts. In Lima's older housing stock, thermocouple failure is the number-one reason, especially during January and February cold snaps.

Who can relight my furnace pilot light in Lima?

Any licensed HVAC technician can relight a pilot and inspect the assembly. Lima Furnace Repair Pros handles pilot relights, thermocouple replacements, and pilot assembly cleanings, usually same-day during heating season. Call (419) 287-8289 to schedule.

How much does a furnace pilot light repair cost in Lima?

Typical 2026 pricing in Lima runs $95-$150 for a diagnostic and relight, $150-$250 if a thermocouple needs replacing, and $250-$450 if the gas valve itself has failed. Most single-visit pilot repairs land under $250.

Get help with Furnace Repair in Lima

If your pilot won't stay lit, or you'd rather have a technician handle it from the start, we're ready. Lima Furnace Repair Pros serves all of Lima and the surrounding Allen County area with same-day pilot and furnace repair.

Call (419) 287-8289 and we'll get your heat back on.