Gas Water Heater Pilot Light Won’t Stay Lit? Here’s Why
The Most Common Cause
A thermocouple (or on newer units, a thermopile/flame sensor) that has failed or is out of position is the most common reason a gas water heater pilot light won’t stay lit. This safety component senses the pilot flame and shuts gas flow if it doesn’t detect heat.
Other Possible Causes
A dirty or clogged pilot orifice, a draft affecting the pilot flame, or a failing gas control valve can also cause this issue, though these are less common than a thermocouple problem.
Safety Note
If you smell gas at any point while attempting to relight the pilot, stop immediately, leave the area, and call your gas utility’s emergency line before contacting a specialist for repair.
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Frequently Asked Questions
Is replacing a thermocouple an easy DIY fix?
While it’s a relatively simple part, working with gas appliances carries real safety risk if done incorrectly — a licensed specialist can typically replace it quickly and safely.
How many times should I try relighting the pilot before calling for help?
If it won’t stay lit after 2-3 attempts following the manufacturer’s instructions, it’s time to call a specialist rather than continuing to try.
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