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Emergency steps

Water Heater Pilot Light Won't Stay Lit: What It Means

Water Heater Pilot Light Won't Stay Lit: What It Means

A pilot light that will not stay lit is most often a worn thermocouple that fails to signal the gas valve to stay open, though a dirty pilot orifice, a draft in the burner compartment, or a failing gas control valve can also cause it - if you smell gas at any point while checking this, stop immediately and follow the gas safety steps rather than continuing to relight it yourself.

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Quick answer

A pilot light that will not stay lit is most often a worn thermocouple that fails to signal the gas valve to stay open, though a dirty pilot orifice, a draft in the burner compartment, or a failing gas control valve can also cause it - if you smell gas at any point while checking this, stop immediately and follow the gas safety steps rather than continuing to relight it yourself.

Decision guide

How to decide what happens next

Start by identifying whether the issue is isolated to one fixture or affects several drains. If the problem is spreading, includes dirty water, or risks property damage, treat it as urgent and request provider guidance.

Checklist

Why a water heater pilot light will not stay lit

A pilot light that keeps going out has a few common causes, most often related to the thermocouple, but a gas smell at any point changes the response entirely.

  • If you smell gas at any point while checking the pilot light, stop immediately, leave the gas valve as is, ventilate the area, and do not attempt to relight it yourself -- treat this as a safety issue first.
  • A worn thermocouple is the most common cause of a pilot that will not stay lit -- this small sensor is supposed to signal the gas valve to stay open once it senses the pilot flame, and it wears out over time.
  • A dirty or partially blocked pilot orifice can prevent a stable flame from forming, which can look similar to a thermocouple issue but has a different fix.
  • A draft in the burner compartment, sometimes from a nearby vent or gap, can blow out a pilot light that would otherwise stay lit.
  • Follow the manufacturer's relighting instructions exactly, usually printed on a label on the unit, and never bypass the built-in safety sequence.
  • If the pilot relights but goes out again within a few minutes every time, that pattern strongly suggests a thermocouple replacement rather than a one-time fluke.

Verification

What to confirm before requesting service

  • Describe exactly how long the pilot stays lit before going out, since this timing detail helps narrow down thermocouple versus other causes.
  • Ask whether a thermocouple replacement is something typically done same-visit or requires a specific part to be ordered for your model.
  • If you smelled gas, mention that explicitly when requesting service so it is treated with appropriate urgency.
  • Ask about the age of your water heater, since a very old unit may be better replaced than repeatedly repaired.
Local service-area guidance

This page is written for homeowners and property managers in Dallas-Fort Worth. Plumbing Hands helps homeowners request emergency plumbing service across Dallas-Fort Worth. Availability, pricing, credentials, and arrival details should be confirmed directly with the matched provider.

Common questions
Is it safe to try relighting the pilot myself?

Following the manufacturer's printed instructions to relight a pilot is generally considered a normal homeowner task. If you smell gas at any point, however, stop immediately and do not attempt to relight it -- that changes the situation from a routine task to a safety issue.

What is the quick decision?

A pilot light that will not stay lit is most often a worn thermocouple that fails to signal the gas valve to stay open, though a dirty pilot orifice, a draft in the burner compartment, or a failing gas control valve can also cause it - if you smell gas at any point while checking this, stop immediately and follow the gas safety steps rather than continuing to relight it yourself.

When should I call instead of waiting?

Call when water damage, wastewater, essential fixture loss, or repeated backup symptoms are present.

What should I do first during a plumbing emergency?

Stop the water source if safe, avoid using affected fixtures, protect people from contaminated water, and request help.

What should I do during an active leak?

Use the closest working shutoff valve, keep water away from electrical areas, and request leak help quickly if water keeps spreading.

When should a drain backup be treated as urgent?

Treat it as urgent when more than one fixture backs up, wastewater appears, or the problem blocks essential use.

Which sewer symptoms need fast attention?

Multiple slow drains, sewer odor, toilet gurgling, dirty tub water, or outdoor cleanout overflow should be treated as urgent warning signs.

When does fixture loss become urgent?

No usable toilet, no hot water for vulnerable occupants, or water near unsafe areas can justify urgent guidance.

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