How to Relight a Water Heater Pilot Light (2026) — Complete Guide

Please note: Information in this guide is based on our research at time of writing and is subject to change. Always consult a licensed plumber or your gas utility for diagnosis of serious gas or plumbing issues before attempting repairs.

Introduction

A pilot light going out is the single most common reason for a sudden loss of hot water in a gas water heater, and it’s usually the easiest problem to fix yourself — no parts, no tools beyond a lighter, and no need to drain the tank. It happens most often after a power outage, a strong draft through a basement or utility room door, or simply after years of normal use, and in the vast majority of cases relighting it is all that’s needed to get hot water flowing again.

If you’ve already ruled out other causes, or you just want the direct fix for this one specific problem, this guide walks through the standard relighting process safely, step by step, plus what it means if the pilot won’t stay lit or won’t light at all.

If you’re not yet sure a dead pilot light is actually your problem, our broader no hot water troubleshooting guide covers the full range of possible causes. And if your water heater has been showing other warning signs recently — not just this one incident — our guide to signs your water heater is failing is worth a look too.

Safety First — When NOT to Attempt This

Before you touch anything on your water heater, read this section. Relighting a pilot is simple, but it involves natural gas, and there’s exactly one condition that changes everything below from a routine fix into an emergency.

Beyond that one hard rule, use your judgment. If your water heater is more than 10 years old and this is a recurring problem, or if you’re uncomfortable at any point in this process, calling a licensed plumber or your gas utility is always a reasonable choice — there’s no downside to having a professional handle it instead. Relighting a pilot is routine maintenance, not a repair you’re obligated to attempt yourself, and there’s no shame in deciding a gas appliance simply isn’t something you want to work on.

What You’ll Need

This is a genuinely low-tool job. Gather these three things before you start:

• A long lighter — safer and easier than matches for reaching the pilot opening without getting your hand close to the flame
• A flashlight, so you can see the pilot assembly and the instruction label clearly, especially if your water heater is in a dim basement or closet
• Your water heater’s owner’s manual or model number, since exact button labeling and timing varies slightly by manufacturer

Step 1 — Turn the Gas Control Knob to Off

Locate the gas control valve on the front of the water heater, usually near the bottom of the tank. It’s typically a dial with three labeled positions — “Off,” “Pilot,” and “On” — and you’ll be moving through all three over the course of this guide. Turn the knob to the “Off” position now.

Step 2 — Wait for Gas to Clear

Wait at least 5 minutes before proceeding, to allow any residual gas near the pilot to dissipate completely. Use this time productively — locate the pilot opening with your flashlight so you’re ready to move directly into the next steps once the wait is over.

Step 3 — Turn the Gas Control Knob to Pilot

After the wait, turn the gas control knob to the “Pilot” setting. This allows a small, controlled amount of gas to flow to the pilot opening only — not to the main burner — which is exactly what you want at this stage.

Step 4 — Press and Hold the Control Knob

Press down on the gas control knob and hold it in — this manually opens the gas valve to the pilot. Continue holding it down through the next step; releasing it now will cut off the pilot gas supply before you’ve even lit anything.

Step 5 — Light the Pilot

While still holding the control knob down, use your long lighter to ignite the pilot through the designated opening. You should see a small, steady flame appear right at the pilot opening.

Pilot lights are far more likely to go out during sudden cold snaps in northern states, particularly across the Midwest and Northeast, when strong drafts from poorly sealed basement or utility room doors can blow out the flame. In homes with older water heaters located in attached garages, a draft from opening the garage door on a windy day is a common and often overlooked cause. If your pilot light goes out repeatedly rather than just once, drafts, a failing thermocouple, or a clogged pilot orifice are the most likely culprits — and repeated outages are worth investigating rather than just relighting every time.

Step 6 — Continue Holding After Ignition

Once the pilot is lit, continue holding the control knob down for 30–60 seconds. This gives the thermocouple time to heat up enough to keep the gas valve open on its own once you let go — it’s the single most important part of the entire process.

Step 7 — Release and Turn to On

Slowly release the control knob and check that the pilot flame stays lit on its own. If it stays lit, turn the gas control knob from “Pilot” to “On.”

Step 8 — Confirm the Pilot Stays Lit

Replace the outer access panel if your model has one. Wait a few minutes and check that the pilot is still burning steadily, then run a hot water tap somewhere in the house and confirm hot water returns within a reasonable time.

If the Pilot Won’t Stay Lit

If the pilot repeatedly goes out after you’ve followed these steps correctly, including a full 60-second hold, the thermocouple is often the culprit. It’s a low-cost, commonly replaced part whose only job is sensing that the pilot flame is present and keeping the gas valve open — once it wears out or drifts out of position, the valve closes as soon as you release the control knob, even with a perfectly good flame. Thermocouples degrade gradually over years of normal heating and cooling cycles, so it’s common for one to start failing right around the time a water heater is otherwise several years old, rather than failing suddenly out of nowhere.

A pilot that won’t light at all despite the gas being on, with no flame appearing even briefly, may point to a clogged pilot orifice or a gas supply issue further upstream rather than a thermocouple problem. If your water heater has been showing other signs of trouble recently — inconsistent temperatures, strange noises, or rust-colored water — our guide to signs your water heater is failing can help you figure out whether this is an isolated issue or part of a bigger pattern.

Frequently Asked Questions

Q: Why does my water heater pilot light keep going out?

The most common causes are drafts, a failing thermocouple, or a clogged pilot orifice. Drafts are especially common during cold snaps in northern states or in attached garages where opening the garage door can blow out the flame. A failing thermocouple typically shows up as a pilot that lights fine but won’t stay lit once you release the control knob, while a clogged orifice tends to produce a weak, sputtering flame even when it does catch. If it’s happened once, relighting it is usually enough. If it keeps happening, one of those three underlying causes is worth investigating rather than relighting the pilot every time it goes out.

Q: Is it safe to relight a water heater pilot light myself?

Yes, for most homeowners this is a safe, routine task as long as you follow the gas safety steps in order — especially turning the gas off and waiting for it to clear before relighting. The one exception is if you smell gas at any point: that means a leak, not a simple pilot light issue, and it requires leaving the house and calling your gas utility or 911 rather than attempting to relight anything.

Q: How long does it take for hot water to return after relighting the pilot?

It can take 30–60 minutes for a full tank to reheat completely after being reignited, so don’t be concerned if your water isn’t immediately as hot as usual. If you still don’t have hot water after an hour or so, double-check that the pilot is still lit and that the control knob is turned to “On” rather than “Pilot.”

Q: What does it mean if the pilot won’t light at all?

If you’re not seeing any flame at all despite following the steps correctly, with the gas control knob confirmed on the “Pilot” setting, this can indicate a clogged pilot orifice or a problem with the gas supply itself rather than something you can easily clear yourself. This is different from a pilot that lights but then won’t stay lit, which usually points to the thermocouple instead. Either way, if two or three attempts don’t resolve it, calling a licensed plumber or your gas utility is the more efficient next step.

Conclusion

Relighting a pilot light is a simple, safe process when the basic gas safety steps are followed correctly — turn the gas off, wait for it to clear, and never skip either step even though it’s tempting to rush straight to relighting. The most common mistake is releasing the control knob too early: hold it a full 30–60 seconds after ignition, and give it closer to the full 60 if the pilot has gone out on you before.

A pilot that won’t stay lit after several careful attempts usually points to a thermocouple issue worth having a professional look at, rather than something to keep troubleshooting indefinitely on your own. And remember the one rule that overrides everything else in this guide: if you ever smell gas, stop, leave the house, and call your gas utility or 911 from outside.

If this was a one-off pilot outage, you should be back to normal hot water within the hour. If you’re dealing with a broader pattern of water heater problems, our guide to no hot water troubleshooting covers the other common causes, our guide to signs your water heater is failing covers the warning signs of a unit nearing the end of its life, and our guide to water heater leaking covers what to do if the pilot isn’t your only concern.