Quick answer: A water-heater pilot that keeps going out is a symptom, not a diagnosis. Possible causes include a flame-sensing component, draft or combustion-air problem, venting issue, ignition fault, gas-supply problem, or control failure. Do not keep relighting it or open the burner compartment to investigate. Follow only the instructions for your exact model—and if you smell gas or a carbon-monoxide alarm sounds, leave immediately and get help from a safe location.
When a water heater lights once and then shuts down, it is tempting to assume the pilot simply needs to be relit. A one-time outage can happen, but a pilot that repeatedly goes out deserves attention. The cause may be a small replaceable component—or a condition involving airflow, venting or the gas-control system that should not be ignored.
First, confirm whether your heater has a pilot
Some older or conventional gas tank water heaters use a standing pilot: a small flame that normally stays lit. Other gas models use electronic ignition and may not have a continuously burning pilot at all. Tankless heaters use their own ignition and safety controls.
Check the model label and owner’s manual before trying anything. If the heater has a status light or display, record its pattern or error code. Do not remove access panels, bypass a safety switch, or assume instructions for a different brand or model apply to yours.
What the failure pattern may tell you
| What you notice | Possible explanations | Safer next step |
|---|---|---|
| The pilot lights but goes out when the control is released | A thermocouple, thermopile, flame-sensing connection or gas control may not be proving that a flame is present. | Stop repeated attempts and have the ignition/safety system diagnosed. |
| The pilot stays lit until the main burner starts | Draft, combustion air, venting or flame-sensing problems may be involved. | Note when it happens; do not adjust the burner or venting yourself. |
| The heater will not ignite and a status light flashes | The control may be reporting a lockout or another fault. The meaning depends on the model. | Record the exact flash pattern and check the matching manual. |
| The problem began after storage or a room change | Items near the heater may have changed required air clearance or airflow. | From a safe distance, look for obvious obstructions and compare with the manual’s clearance instructions. Do not remove covers. |
| You see soot, scorching, damaged vent parts or unusual combustion signs | The heater may not be burning or venting correctly. | Stop using the appliance and arrange a qualified inspection. |
These are clues, not a remote diagnosis. A professional may need to check the flame-sensing system, burner condition, combustion air, venting, gas pressure and controls. Do not try to test gas pressure, clean internal burner parts, or defeat a safety device yourself.
Safe checks before calling
- Identify the heater. Note the brand, model, fuel type and approximate age from the label if it is accessible without moving the unit or removing a panel.
- Write down the sequence. Does the flame never appear, go out as soon as the control is released, or fail after the main burner starts? Note any status light or error code.
- Look for obvious changes around the appliance. New boxes, stored items or other obstructions near an air intake can matter. Do not move a heavy heater, climb to inspect a roof vent, or open the combustion compartment.
- Use the manual—not a generic relighting recipe. If your exact model’s instructions permit homeowner relighting, follow the label and manual exactly, including the required waiting period and limits on attempts. If it fails to light or will not stay lit, stop and call for service.
- Keep the area safe. Do not use the heater if you see damage, soot, water around electrical parts, or a vent that appears disconnected. Do not operate an appliance that has been flooded or otherwise damaged.
If your unit is electric, it does not have a gas pilot. A loss of hot water can have a different cause; do not open the electrical compartment or remove covers to investigate.
When to stop and leave the area
If you smell natural gas, hear gas escaping, or suspect a gas leak, do not try to relight the heater. Leave the area immediately. Do not turn lights or appliances on or off, use a phone inside, light a flame, or try to repair the leak. From a safe location, call SoCalGas at 1-800-427-2200; call 911 if there is immediate danger.
Carbon monoxide has no smell. If a CO alarm sounds—or anyone has possible symptoms such as headache, dizziness, weakness or nausea—get everyone outside to fresh air and call 911. Do not re-enter or operate the heater until emergency responders say it is safe. The U.S. Consumer Product Safety Commission’s CO guidance explains these precautions.
Repair or replace?
A pilot that goes out does not automatically mean the whole water heater needs replacement. The decision depends on the confirmed fault, the condition and age of the tank, whether parts are available, prior repeat failures, and the cost of a sound repair compared with replacement.
If the tank itself is leaking or badly corroded, the conversation is different from replacing a failed ignition or flame-sensing component. A tankless system also needs a model-specific diagnosis; its ignition and error-code process is not the same as a standing-pilot tank. See Precision One’s water-heater repair and replacement service or the separate tankless water-heater service page for the relevant service scope.
Questions to ask about the estimate
- What test confirmed the cause, rather than just showing that the pilot went out?
- Were the flame-sensing component, combustion air, venting and applicable safety controls checked?
- Which part or condition needs attention, and why would the repair address the repeated outage?
- Does the estimate separate diagnosis, parts and labor, and explain any additional access or venting work?
- Given the heater’s age and condition, what are the practical repair and replacement options? Are any manufacturer warranty terms relevant to this exact model?
There is no reliable one-price answer for every pilot problem. A simple component issue and a venting or gas-supply concern have very different scopes. Ask for the confirmed diagnosis and written options before approving work.
Frequently asked questions
Should a water-heater pilot stay lit all the time?
A conventional standing pilot normally remains lit, but some newer gas models use electronic ignition and do not have an always-on pilot. Check the instructions for your exact model.
Can I relight it myself?
Only if the manufacturer’s instructions for your model allow it, there is no sign of a gas leak or carbon-monoxide hazard, and you can follow the instructions exactly. Stop if it will not light or stay lit as directed; do not keep retrying.
Does a pilot outage mean the heater is unsafe?
Not every outage proves a dangerous fault, but a recurring outage can involve combustion or safety controls. Treat soot, damaged venting, gas odor, a CO alarm or repeated shutdowns seriously and do not bypass safety devices.
Manufacturer and safety references
- A. O. Smith: How to relight a water-heater pilot — model-specific instructions and possible causes.
- SoCalGas: What to do if you suspect a natural-gas leak.
- U.S. CPSC: Carbon-monoxide alarms and emergency response.
Need help with a water heater that will not stay lit?
Precision One Services provides water-heater repair and replacement options in Beaumont and surrounding Inland Empire communities. When scheduling, share the model, any status-light code, and what happens when the heater shuts down. If you need general plumbing help, you can also review our plumbing repair service.
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