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Water Heater Pilot Light Keeps Going Out

Water Heater Pilot Light Keeps Going Out: Common Causes + When to Replace
If your water heater pilot light keeps going out, you’re not alone—and it’s not something you want to “just relight forever.” A pilot that won’t stay lit can mean anything from a dirty component to a failing gas control valve, and in some cases it can be a real safety issue.
Specialty Plumbing and Drain LLC helps homeowners across North Metro Atlanta troubleshoot and fix gas water heater problems quickly and safely. We’re headed up by an Unrestricted Master Plumber, so you’re not getting guesswork—you’re getting a real diagnosis and a permanent fix.
Why does a water heater’s pilot light keep going out?
Most of the time, a pilot light keeps going out because the water heater isn’t getting a stable gas supply, the pilot assembly can’t stay lit, or a safety device is shutting the gas off.
Common causes include a dirty pilot orifice, a weak/failed thermocouple, downdrafts or poor venting, low gas pressure, or a failing gas control valve/thermostat.
What type of water heater do you have?
This post is mainly for gas water heaters with a standing pilot light. If you have:
- A newer gas unit with an electronic igniter (no standing pilot)
- An electric water heater (no pilot)
- A tankless water heater
…the troubleshooting is different. If you’re not sure, Specialty Plumbing and Drain LLC can identify what you have and what’s actually failing.
What you can safely check (before calling a plumber)
A few checks are reasonable for a homeowner. If you smell gas, stop and call for help.
1) Do you smell gas?
If you smell gas near the water heater or meter:
- Don’t flip switches on/off
- Leave the area
- Call your gas utility if the smell is strong
- Then call Specialty Plumbing and Drain LLC to diagnose and repair the issue
2) Is the area around the water heater getting a draft?
A strong draft can blow out a pilot or interfere with combustion.
- Check for a nearby open door, attic pull-down, return vent, or fan that’s pulling air
- If the pilot goes out mainly on windy days, venting/downdraft is a prime suspect
3) Is the vent pipe loose, disconnected, or backdrafting?
Don’t disassemble venting yourself, but you can visually check for obvious issues:
- Loose vent connections
- Corrosion holes
- Signs of soot or scorching
If you see any of that, it’s time to call Specialty Plumbing and Drain LLC.
The most common causes (and what they usually mean)
Cause 1: Bad thermocouple (or flame sensor)
On many standing-pilot gas water heaters, the thermocouple is a safety device. It “proves” the pilot flame is lit. If it fails, the gas valve shuts off and the pilot won’t stay lit.
Typical symptoms:
- Pilot lights, but goes out when you release the button
- Pilot stays lit sometimes, then randomly drops out
Common fix: thermocouple replacement and proper pilot adjustment.
Cause 2: Dirty pilot assembly / clogged pilot orifice
Dust, lint, and debris can restrict the pilot flame.
Typical symptoms:
- Small, weak pilot flame
- Pilot blows out easily
- Pilot is hard to relight
Common fix: cleaning/service of the pilot assembly (and checking combustion/air supply).
Cause 3: Failing gas control valve / thermostat
If the gas control valve is failing, it may shut off gas intermittently or fail to keep the pilot stable.
Typical symptoms:
- Pilot won’t stay lit even after thermocouple replacement
- Inconsistent hot water
- Temperature swings
Common fix: replace the gas control valve (and verify safe operation).
Cause 4: Venting problems (downdraft, blockage, improper draft)
If the venting isn’t drafting correctly, it can affect combustion and safety. In some cases, safety mechanisms can trigger shutdown.
Typical symptoms:
- Pilot goes out more often on windy days
- Soot around the draft hood
- “Hot” or stuffy air around the unit
Common fix: venting correction and combustion air evaluation.
Cause 5: Low gas pressure or gas supply issues
Sometimes the water heater is fine—the gas supply isn’t.
Typical symptoms:
- Multiple gas appliances acting up
- Weak burner flame
- Pilot issues after other gas work or appliance additions
Common fix: diagnose supply pressure/volume issues and correct the piping, regulator, or meter-area problems as needed.
Cause 6: Dirty burner or combustion issues
A dirty burner can cause poor flame characteristics and unreliable operation.
Typical symptoms:
- Delayed ignition
- Rumbling/“whoosh” sounds
- Sooting
Common fix: burner service and combustion check.
When it’s time to replace the water heater (not just fix the pilot)
Specialty Plumbing and Drain LLC is always going to be straight with you: sometimes a repair is smart, and sometimes replacement is the better long-term move.
You should strongly consider replacement if:
- The unit is 10–12+ years old (common lifespan range)
- The tank is rusting, leaking, or showing corrosion at the base
- You’ve already replaced the thermocouple/control and problems keep returning
- Repairs are stacking up and you want reliability
- You want better efficiency or more hot water capacity
If you’re unsure, Specialty Plumbing and Drain LLC can give you a clear repair-vs-replace recommendation based on condition, safety, and cost.
Why you should avoid repeated DIY relighting
Relighting a pilot once after a one-time outage is one thing. Relighting it every few days is a warning sign.Repeated pilot outages can indicate:
- A safety device doing its job
- A gas supply issue
- A venting/combustion problem
That’s why Specialty Plumbing and Drain LLC treats “pilot keeps going out” as a real diagnostic—not a quick band-aid.
Get your hot water back (and keep it back)
If your water heater pilot light keeps going out, don’t wait until you’re stuck without hot water—or dealing with a bigger gas/venting issue. Specialty Plumbing and Drain LLC can troubleshoot the cause, make the right repair, and confirm the system is operating safely.
Call Specialty Plumbing and Drain LLC today to schedule water heater service in North Metro Atlanta. If you need help fast, ask about priority service so you can get hot water restored ASAP.
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