Why does the pilot go out when I release the knob?

The flame-safety circuit may not be receiving the signal it needs. That can involve the lighting procedure, pilot flame, sensor or control. It does not prove a bad thermocouple. Follow the label’s failed-lighting shutdown instruction and request service.

How many times can I try relighting?

Use your exact lighting label, not a generic number. Manufacturer waiting times and failed-attempt limits differ. Stop at that limit, if the control sticks, or if a hazard appears. A recurring failure needs service, not another sequence of attempts.

Is the thermocouple the same as a thermopile?

No. Both can supply a flame-related signal, but they are different components used with different controls. Your model determines the assembly. Do not buy a universal probe or replace either component from this symptom alone.

Does a pilot going out later mean a draft problem?

Airflow or venting is possible, but the timing does not confirm it. Gas supply and safety controls may also be involved. Record the pattern without recreating it. Suspected inadequate combustion air requires a technician before relighting because carbon monoxide can be a risk.

Does water near the burner mean I need a new tank?

Not necessarily. Manufacturer guidance describes condensation when a tank contains cold water. Plumbing leaks are another possibility. A technician must identify the source; a confirmed tank leak differs from condensation. Flooded or submerged controls need qualified assessment before operation.

What should I pay to fix a pilot that will not stay lit?

The symptom alone cannot establish a price. Ask for the confirmed cause, correct model-specific assembly, labor, safety checks and warranty coverage in writing. Compare that complete quote with replacement, rather than treating a cheap sensor as a safe homeowner experiment.

Any brand · Gas storage water heater · Symptom

Water heater pilot won't stay lit

safe checks

What it means

If you smell gas, do not relight anything, touch electrical switches or use a phone inside. Leave and call your gas supplier from outside. If you cannot reach them, call the fire department. A carbon monoxide alarm also means leave and call emergency services.

This guide covers gas storage water heaters with a standing pilot, not electric tanks or automatic ignition systems. A pilot light that goes out can leave the heater without the flame signal needed to keep supplying gas. That does not identify a failed part.

Some models use a thermocouple; others use a thermopile and additional safety controls. The correct lighting procedure depends on the model and gas control. Your heater’s lighting label and manufacturer manual take priority over this guide.

Likely causes, ranked

Lighting procedure does not match the modelcheck the label first; waiting, ignition and control-holding instructions vary between heaters
Pilot flame or flame-sensing problema weak pilot, thermocouple or thermopile fault may stop the pilot staying lit after release; timing alone proves none of them
Air supply, venting or a safety shutdowna pilot that goes out later may involve airflow or a safety control; suspected unsafe venting needs service before relighting
Gas supply or gas control faultpressure and control problems can also interrupt the pilot; a qualified provider must diagnose them

Ordered by what to verify before buying a part, not measured failure rates. Timing and the model matter; these causes are not confirmed diagnoses.

Verdict, in general terms

Do not buy a thermocouple from this symptom alone. If label-authorized lighting does not restore reliable operation, leave the heater off and request qualified service. A confirmed repairable pilot fault does not automatically justify a new tank. Ask for the total repair quote, warranty coverage and an installed replacement quote. Compare repair cost with replacement cost, tank condition and remaining warranty. Water near the heater is not proof of a failed tank: condensation and plumbing leaks need distinguishing from a confirmed tank leak.

Stop for gas odor, a carbon monoxide alarm, soot, a damaged viewing window, visible vent damage or suspected blocked combustion air. Do not relight to test a suspected hazard. Never open the sealed burner door, bypass a safety device or repair a gas connection.

The checks, in order

4 checks

Check 1 — Read the model plate and lighting label
3 minutes · model manual
This eliminates: using another heater’s instructions; it does not rule out a fault.
From safe external access, record the brand, model and gas type. Read the complete lighting label, including shutdown and failed-attempt instructions. If the label is missing, unreadable or does not match the control, stop and request manufacturer guidance. Do not borrow another model’s procedure.
Check 2 — Record external warning signs without running the heater
3 minutes · no tools
This eliminates: nothing definitively; visible hazards end homeowner checks.
Only when there is no emergency, look from outside for stored materials blocking air openings, soot, visible vent damage and water. Do not disassemble, adjust the vent or perform a smoke or match test. Suspected air or vent problems need qualified assessment before relighting. Report water without assuming its source.
Check 3 — Follow only label-authorized lighting, if safe
as the label states · lighting label
This eliminates: an extinguished pilot as the immediate concern only if operation remains normal; it does not prove the cause.
Proceed only with readable, matching instructions, safe access and no warning signs. Follow the label’s waiting time, ignition method, holding time and attempt limit exactly. Use the provided viewing window; never open a sealed burner door or hand-light a piezo-equipped chamber. If the control sticks, stop immediately and call for service. If the pilot will not hold, follow the label’s OFF instruction and call your technician or gas supplier. Do not keep relighting a recurring failure.
Check 4 — Write down when the pilot goes out
2 minutes · notes
This eliminates: no component; the pattern helps a technician choose the next check.
Record what you already observed: no ignition, failure when releasing the control, or failure later. Copy any status-light pattern with its model-specific label meaning. Do not run the heater again to reproduce the fault. Report only observations, not assumed thermocouple, valve or draft diagnoses.

Stop line

Gas component testing, cleaning and replacement are the stop line. Do not reposition, sand or replace a sensor, clean an orifice, disconnect tubing or reset safety devices. Use a qualified water-heater service provider. Leave the heater off after failed lighting as its label directs.

What to tell the technician: “My gas water heater is [brand and model]. The pilot goes out [when observed]. The status light shows [pattern]. I followed these label instructions and observed these external warning signs. I have not opened the burner chamber or replaced parts.” Report only what happened.
What to ask: Ask whether the diagnosis includes combustion air, venting, the pilot assembly, flame sensing and gas control. Ask for a written parts-and-labor total and warranty coverage before approving a repair. A Second Opinion is not emergency service or a substitute for onsite gas-safety assessment.
What a fair price looks like: We do not have a verified local installed price for your model. Compare written quotes for the same confirmed repair and an installed replacement. Include permits, vent work and disposal where required. A low part-only price is not the total cost of safe gas work.

Common questions

6 questions

Why does the pilot go out when I release the knob?: The flame-safety circuit may not be receiving the signal it needs. That can involve the lighting procedure, pilot flame, sensor or control. It does not prove a bad thermocouple. Follow the label’s failed-lighting shutdown instruction and request service.
How many times can I try relighting?: Use your exact lighting label, not a generic number. Manufacturer waiting times and failed-attempt limits differ. Stop at that limit, if the control sticks, or if a hazard appears. A recurring failure needs service, not another sequence of attempts.
Is the thermocouple the same as a thermopile?: No. Both can supply a flame-related signal, but they are different components used with different controls. Your model determines the assembly. Do not buy a universal probe or replace either component from this symptom alone.
Does a pilot going out later mean a draft problem?: Airflow or venting is possible, but the timing does not confirm it. Gas supply and safety controls may also be involved. Record the pattern without recreating it. Suspected inadequate combustion air requires a technician before relighting because carbon monoxide can be a risk.
Does water near the burner mean I need a new tank?: Not necessarily. Manufacturer guidance describes condensation when a tank contains cold water. Plumbing leaks are another possibility. A technician must identify the source; a confirmed tank leak differs from condensation. Flooded or submerged controls need qualified assessment before operation.
What should I pay to fix a pilot that will not stay lit?: The symptom alone cannot establish a price. Ask for the confirmed cause, correct model-specific assembly, labor, safety checks and warranty coverage in writing. Compare that complete quote with replacement, rather than treating a cheap sensor as a safe homeowner experiment.

Manufacturer guidance

Reviewed 17 October 2026. These sources cover different models, not a verified match to your heater. Use your own model’s manual and lighting label.

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