Hold the pilot light button for 30 to 60 seconds after the flame ignites

When you light the pilot on a gas water heater, you push and hold the ignition button (usually labeled "Pilot") for 30 to 60 seconds after you see the flame appear. The button keeps gas flowing to the pilot burner while the thermocouple — a heat-sensing device near the flame — warms up. Once the thermocouple is hot enough, it signals the gas valve to stay open on its own, and you can release the button.

If you release the button too soon, the pilot will go out because the thermocouple hasn't warmed enough yet. If you hold it longer, you're just wasting time; 60 seconds is the standard window. Some water heaters have a slightly shorter or longer window depending on the thermocouple design, but 30 to 60 seconds covers nearly all residential units.

After you release the button, the pilot flame should stay lit. If it goes out within a few seconds, the thermocouple may be dirty, failing, or positioned incorrectly — all reasons to call a technician rather than keep relighting it.

Key Takeaways

  • Push and hold the pilot button for 30 to 60 seconds after you see the flame, not before.
  • The button keeps gas flowing while the thermocouple heats up and learns to hold the valve open on its own.
  • If the pilot goes out within seconds of releasing the button, the thermocouple is likely faulty and needs professional inspection.
  • Holding the button longer than 60 seconds does not help; the thermocouple reaches full temperature well before that.
  • Never force the button or hold it down hard — a gentle, steady press is all that is needed.

Why the thermocouple matters

The thermocouple is a small metal rod that sits in the pilot flame. As it heats up, it generates a tiny electrical signal that tells the main gas valve "the pilot is burning, so it is safe to keep the gas line open." Without this signal, the valve closes automatically as a safety measure.

When you hold the button, you are manually overriding the valve to let gas through. The thermocouple is warming during those 30 to 60 seconds. Once it reaches about 700 degrees Fahrenheit, the signal is strong enough that the valve stays open without your help. That is why you can let go.

If the thermocouple is coated with soot or carbon buildup, it will not generate a strong enough signal, and the pilot will not stay lit even after you release the button. Cleaning the thermocouple sometimes fixes this, but it requires removing the burner assembly — a job best left to a technician.

What happens if you release too early

If you let go of the button before 30 seconds have passed, the thermocouple is still too cool to hold the valve open. The gas supply cuts off, and the pilot flame dies. You will see it go out almost when ready after you release the button.

This is not dangerous — it is just frustrating. The safety system is working as designed. You straightforward need to try again and hold the button longer. There is no penalty for a failed attempt; you can relight as many times as needed.

Some people worry they are doing something wrong if the pilot goes out on the first try. Usually it just means they did not hold long enough. Count to 30 slowly in your head, or use the second hand on a clock or phone to time it. Once you have held for a full 30 seconds, release and watch for a few more seconds to confirm the flame stays lit.

The difference between the pilot button and the main knob

The control panel on your water heater has two separate controls: the pilot button (usually red or black, sometimes recessed) and the main gas knob (usually a larger dial with "Off," "Pilot," and "On" marked on it). You need both in the right position for the pilot to light.

First, turn the main knob to "Pilot." Then press and hold the pilot button while you ignite the flame with a long lighter or match held near the burner opening. Once the flame is visible, keep holding the button for 30 to 60 seconds. After you release the button and confirm the flame stays lit, turn the main knob from "Pilot" to "On" to heat water normally.

If you turn the main knob to "On" before the thermocouple is ready, the burner will not ignite because the valve is still closed. Always light the pilot first, confirm it stays lit after you release the button, and only then switch the main knob to "On."

When to call a technician instead of relighting

If the pilot goes out repeatedly even though you are holding the button for a full 60 seconds, or if it will not stay lit for more than a few seconds after you release the button, the thermocouple is likely faulty. A faulty thermocouple cannot be fixed by relighting — it needs to be replaced.

Other signs that you need professional help: the pilot flame is very small or yellow instead of blue, there is a strong gas smell near the water heater, or the main burner will not ignite even though the pilot is lit. These point to problems with the gas line, the valve, or the burner itself — not something you should troubleshoot by relighting repeatedly.

Calling a technician is the safe choice. A water heater technician can test the thermocouple with a meter, clean or replace it, and check that the whole system is working safely. The cost is usually $150 to $300 for a service call and repair, which is far less than the cost of a new water heater if something goes wrong.

Holding the button in cold weather

In very cold climates, the thermocouple may take slightly longer to warm up because the surrounding air is cold. If you live somewhere with freezing winters and the pilot keeps going out after 30 seconds, try holding the button for the full 60 seconds before releasing. The extra time gives the thermocouple a better chance to reach full temperature.

If even 60 seconds is not enough, the thermocouple is probably failing and needs replacement. Cold weather does not usually prevent a healthy thermocouple from working — it just slows it down slightly. If you are in a cold climate and the pilot has always stayed lit, a sudden change means something has degraded.

Frequently Asked Questions

Can I hold the pilot button down for longer than 60 seconds?

Yes, holding it longer will not hurt anything, but it is unnecessary. The thermocouple reaches full temperature well before 60 seconds, so the extra time does not improve your chances. If the pilot does not stay lit after 60 seconds, holding longer will not fix it — the problem is with the thermocouple or another component.

What if I can't see the pilot flame when I'm holding the button?

Make sure your lighter or match is actually touching the burner opening where the pilot flame should appear. If you are lighting it correctly and no flame shows up, the gas may not be reaching the pilot burner. Check that the main knob is set to "Pilot" and that you are pressing the pilot button firmly. If still no flame, stop and call a technician — there may be a blockage or a valve problem.

Is it normal for the pilot to go out after a few days?

No. A healthy pilot should stay lit indefinitely until you turn off the water heater or the main gas supply. If the pilot goes out on its own after days or weeks, the thermocouple is failing and needs to be replaced. Do not keep relighting it — have a technician inspect it.

Do I need to hold the button if I'm using an electronic igniter?

Some newer water heaters have an electronic igniter button instead of a manual pilot light. These work differently — you press the igniter button to create a spark, and the system lights itself. Check your manual to see if your model has electronic ignition or a traditional pilot light. If you have electronic ignition, you do not hold a button continuously; you just press it once or twice to trigger the spark.

What if the pilot button is stuck or hard to press?

A stuck button usually means the valve mechanism inside is corroded or blocked. Do not force it — forcing can damage the valve further. Turn off the gas at the main supply and call a technician. Trying to force a stuck button can create a gas leak or prevent the safety valve from closing properly.