Stop After 2 Tries: Relight Water Heater Pilot Light, Homeowners
Yes, you can usually relight a gas water heater pilot yourself if you do not smell gas and you follow the instructions printed on your unit’s label. If you smell gas or notice soot near the burner, stop immediately, leave the area, and call your gas company from outside. Manufacturer instructions vary by model, so the label always overrides general steps like the ones below.
TL;DR:
Most pilot lights can be relit safely without gas smell, but immediate evacuation is necessary if you detect gas, soot, or damage around the vent.
The typical relight process involves turning the gas to off, waiting 5 to 10 minutes, then pressing and holding the pilot knob while igniting the flame and holding for 30 to 90 seconds.
Repeated failed attempts beyond two are usually caused by thermocouple issues, vent blockages, or faulty gas control valves, requiring professional inspection.
A yellow or orange pilot flame indicates incomplete combustion, often caused by air or venting issues, which warrants prompt diagnosis.
Installing working carbon monoxide alarms and stopping relights after two failed tries prevents safety risks linked to gas leaks and CO poisoning.
Table of Contents
How to relight the pilot light step by step
Before touching anything, find the gas control valve on the front of the tank and read the label attached to it. Manufacturers print model-specific relight steps directly on the unit because timing and button sequences differ between standing-pilot and electronic-ignition systems.
Once you have confirmed there is no gas smell, work through these steps in order:
Turn the gas control knob to “Off” and wait 5 to 10 minutes. This clears any lingering gas from the area around the burner before you introduce a flame.
Turn the knob to “Pilot.” This is a separate setting from “Off” and “On,” and most valves require you to pass through it deliberately.
Press and hold the knob down. Holding it open lets gas flow to the pilot burner while you ignite it.
Light the pilot using the built-in igniter button or a long lighter, then keep holding the knob down for 30 to 90 seconds after the flame catches. According to manufacturer relight guidance, this window gives the thermocouple or thermopile time to heat up and send a steady signal to the gas valve. Releasing the knob too early is the most common reason a relight fails.
Release the knob slowly and check that the pilot stays lit on its own.
Turn the control to “On” and watch for a steady blue flame at the main burner, along with any status light blinking in the pattern described on the label.
Give yourself two tries at most. If the pilot won’t catch, or catches and dies as soon as you let go of the knob both times, stop and move to the diagnostic checks below rather than repeating the process indefinitely.
Pro Tip: Keep a flashlight and your phone’s camera handy. Filming the flame while you hold the knob makes it much easier to describe the exact failure pattern to a technician later.
How do you know the pilot is actually out?
A few symptoms point clearly to a dead pilot rather than some other plumbing problem. Before you disassemble anything or call for service, run through this quick check.
No hot water anywhere in the house, combined with silence from the tank instead of the usual burner hum, suggests the pilot has gone out.
The sight glass or viewing port on the front of the tank shows no small blue flame where the pilot normally burns.
A blinking or solid status light near the control valve, on models that have one, often signals an ignition fault, though the exact pattern varies by manufacturer.
A rotten-egg or gas smell near the tank means you should not attempt anything else. Leave the house and call your gas provider from outside, since CPSC guidance treats a gas odor as a potential leak requiring evacuation.
While you are down there, glance at the main gas supply valve to confirm it is fully open, and look for soot streaks, rust, or moisture around the vent pipe. Any of those signs mean the problem may be bigger than a simple pilot outage, and lighting the pilot again without addressing them is not a good idea. If everything above points away from the pilot itself, for example if you still hear the burner running but water never gets hot, the fault is more likely in the thermostat or dip tube, and relighting steps won’t help.
What usually causes a pilot to go out
Once you have confirmed the pilot is out, the way it behaves when you try to relight it usually points to the cause. Four patterns come up most often.
Thermocouple failure is the most common cause of a pilot that lights while you hold the knob but dies the instant you let go. According to Howtodrainahotwaterheater, this pattern means the thermocouple isn’t generating enough voltage to hold the gas valve open on its own. Sometimes cleaning soot off the tip with fine sandpaper or repositioning it closer to the pilot flame solves the problem. When cleaning doesn’t help, thermocouples are inexpensive to replace, but the job involves working directly on a live gas line, which is where many homeowners choose to call a technician instead.
Clogged pilot tube or orifice shows up as a weak, small, or yellow flame instead of a steady blue one. A gentle pass with compressed air or a fine needle can clear light debris, but forcing anything into the orifice risks damaging it.
Drafts and venting issues blow the pilot out repeatedly, especially right after you relight it. Check the vent cap outside for damage or blockage, and make sure nothing is restricting combustion air in the room, since CPSC’s carbon monoxide guidance notes that blocked vents can create downdrafts that prevent stable combustion.
Gas control valve problems are less common but more serious, and they usually show up as a pilot that simply won’t ignite at all despite fresh gas flow and a clean orifice. These are professional repairs, since the valve itself is a sealed safety component.
Air in the line after a new installation or recent gas work can cause the first few ignition attempts to fail even though nothing is broken. Manufacturer instructions typically allow repeated tries with the standard wait times built in for this reason.
Pro Tip: If the flame lights and holds steady but looks more yellow-orange than blue, don’t ignore it. That color usually means incomplete combustion, which is a venting or air-supply issue worth having checked even if the pilot itself seems fine.
Why carbon monoxide risk matters here
Every step in a pilot relight happens next to an open gas flame and a vent that carries combustion byproducts out of your home, which is why carbon monoxide safety belongs in the same conversation; if you need professional help, consider Boiler Repair & Installation in Billings, MT for expert service.
Several people die every year in the United States from carbon monoxide poisoning linked to non-automotive consumer products, according to CPSC, including malfunctioning water heaters. That figure is the reason a working CO alarm matters as much as a working pilot light.
Install battery-backed or interconnected CO alarms outside every sleeping area, and test them on the schedule printed on the unit. If an alarm ever goes off while you are working near the water heater, treat it as real: leave the house, get everyone outside, and call for help before you try to figure out why. The same rule applies to a gas smell. CPSC is direct on this point: a gas odor means potential leak, and the correct response is to evacuate and call the gas company from outside rather than attempting to relight anything. Soot around the burner, rust on the vent pipe, or unexplained moisture on nearby windows are quieter warning signs of the same underlying problem and should stop you from using the water heater until someone inspects it.
When to stop and call a licensed technician
DIY relighting has real limits, and knowing where they are protects both your home and your safety.
Call immediately if you smell gas at any point, see soot on or around the burner, or notice signs of a damaged vent or chimney.
Stop after two failed relight attempts. Continuing to force it, according to Bellevue Plumber Pro’s troubleshooting guidance, often means the real problem is a gas control valve or venting fault that a pilot relight can’t fix.
Bring in a professional for parts beyond the thermocouple, since gas valve replacement and vent or flue repair both involve work most homeowners aren’t equipped to do safely.
A technician’s first visit typically checks gas supply pressure, tests the thermocouple or thermopile output, inspects the gas control valve, and confirms the venting and combustion air path are clear. If your water heater is more than 10 years old, has failed repeatedly despite a clean pilot system, or shows rust or moisture around the tank itself, that combination often points toward replacement rather than another repair. A single thermocouple swap on an otherwise healthy five-year-old tank is a different conversation than a third service call on a unit that is already past its expected lifespan.
What a repair-first visit actually looks like
Texas Comfort Crew’s approach starts with a full diagnostic, not a replacement quote, because most pilot and ignition problems trace back to one part rather than the whole unit. That matches what shows up in the field: a cleaned orifice or a new thermocouple solves far more calls than a full tank swap does.
Before you call anyone, a little prep speeds up the visit. Clear the area around the water heater so a technician has room to work, and write down exactly what you observed, including the model number on the label, when the pilot went out, and whether a CO alarm ever sounded. Homeowners who capture that detail upfront tend to get a faster, more accurate diagnosis on the first visit instead of a second trip to confirm what already happened.
The gap between manufacturer instructions and real homes
Manufacturer relight guides assume ideal conditions: a clean orifice, a properly sized vent, and a thermocouple that just needs a warm-up. Most pilot problems that keep coming back don’t fit that assumption, and that is where generic troubleshooting articles tend to stop short.
The honest pattern worth remembering is this: a pilot that won’t hold after two careful attempts is rarely a lighting-technique problem. It is a parts or venting problem wearing a lighting-technique disguise. Homeowners who keep relighting a pilot for the fifth or sixth time over a few weeks are usually delaying a ten-minute thermocouple swap, not saving money by avoiding one.
The other underrated point is timing discipline. Skipping the 30 to 90 second hold, or the 5 to 10 minute wait after a suspected gas smell, causes more failed relights and false alarms than any mechanical fault does. Read the label, respect the clock, and treat two failed attempts as your stopping point rather than a challenge.
— Dan Patino
Get a technician out for your water heater
If your pilot light keeps failing, or you’d rather not work around an open gas flame yourself, Technicians handle diagnostics from thermocouple swaps to gas valve service and vent or CO checks in residential service areas. The approach focuses on repair first and explaining the actual cause before discussing replacement, so homeowners understand the service provided.
Before you call, have your water heater’s model number, a description of what happens when you try to relight it, and whether a CO alarm has gone off. That information alone often narrows down the likely fix before the technician even arrives.
Browse our plumbing and water heater services to see what’s covered.
Ask about a membership plan if repeat pilot issues are becoming a pattern in your home.
Reach out through our main service page to schedule a visit.
Where to check model-specific and safety guidance
For anything model-specific, check your unit’s label first. A.O. Smith’s relight instructions and CPSC’s carbon monoxide fact sheet cover the two areas homeowners ask about most.
Sources
FAQ
Can I relight the pilot light myself on a water heater?
Yes, in most cases you can relight it yourself as long as there is no gas smell and you follow the steps printed on your unit’s label. If you do smell gas at any point, stop, leave the house, and call your gas company from outside instead of attempting a relight.
How do I know if my water heater pilot light is out?
The clearest signs are no hot water anywhere in the house, silence from the burner, and no small flame visible through the sight glass on the tank. Some models also show a blinking status light near the control valve when the pilot has failed.
Will a water heater leak gas if the pilot light goes out?
A water heater’s gas control valve is designed to shut off gas flow to the burner when the pilot goes out, so a leak is not the expected outcome. If you smell gas near the tank regardless, treat it as a possible leak, leave the house, and call your gas provider from outside rather than investigating further yourself.
How do I reset a pilot light on a hot water heater?
Turn the gas control knob to “Off” and wait 5 to 10 minutes, then switch it to “Pilot,” hold the knob down, and ignite the pilot while continuing to hold for 30 to 90 seconds so the thermocouple heats up. Release slowly, then turn the control to “On” and confirm the burner lights with a steady blue flame.
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