When your hot water heater stops working, the first thing you might think is: reset it. And for many common problems, that’s exactly what you need to do. But resetting isn’t just flipping a switch-it’s a process that varies depending on whether you have an electric or gas model. Skip the guesswork. Here’s how to do it right, safely, and without calling a plumber unless you absolutely have to.
Why Your Water Heater Might Need a Reset
A water heater doesn’t just break randomly. Most times, it shuts down because of a safety feature kicking in. The most common triggers:- A tripped high-limit switch (electric models)
- A failed pilot light (gas models)
- Overheating from sediment buildup
- Power surge or loose wiring
Resetting an Electric Water Heater
Electric water heaters have a reset button, usually red, tucked behind a small panel on the side of the tank. It’s not always easy to find, so follow these steps carefully.- Turn off the power. Go to your circuit breaker and shut off the breaker labeled "water heater" or "HW". This isn’t optional. Working on live electrical components is dangerous.
- Locate the reset button. Remove the metal access panel on the upper part of the tank. Behind it, you’ll see two thermostats. The reset button is usually a small red circle between them. It might be covered by insulation-carefully pull it aside.
- Press the button. You’ll hear a click. That’s the high-limit switch resetting. Don’t force it. If it doesn’t click, don’t keep trying.
- Restore power. Go back to the breaker and turn it back on.
- Wait and test. Give it 30 to 60 minutes to heat up. Then check a faucet. If hot water returns, you’re done. If not, the problem might be a faulty heating element or thermostat.
Important: If the reset button trips again within a few hours, don’t keep resetting it. Something’s wrong-probably a bad element, thermostat, or wiring issue. Continuing to reset it risks overheating and damage.
Resetting a Gas Water Heater
Gas water heaters don’t have a reset button. Instead, they rely on a pilot light and thermocouple to stay lit. If the water’s cold and the burner won’t ignite, you’re likely dealing with a pilot light that went out.- Turn the gas valve to "Off." Locate the gas control valve at the bottom of the heater. Turn the dial to "Off." Wait at least 5 minutes to let any leftover gas clear out.
- Find the pilot light assembly. Remove the outer access panel. You’ll see the burner chamber and a small tube with a flame port. Some models have a viewing window.
- Turn the dial to "Pilot." Press and hold the pilot button (or the gas valve itself, depending on the model).
- Light the pilot. Use a long match or butane lighter to ignite the pilot through the access hole. Keep holding the button for 30 to 60 seconds after the flame catches. This lets the thermocouple heat up and signal the gas valve to stay open.
- Release the button and turn to "On." If the flame stays lit, turn the dial to "On." If it goes out, repeat the process. If it still won’t stay lit, the thermocouple is likely faulty.
Pro tip: If your pilot light keeps going out, check for drafts or a dirty burner tube. Dust, lint, or even spider webs can block the gas flow. Use a small brush or compressed air to clean it gently.
What Not to Do When Resetting
People make the same mistakes over and over. Avoid these:- Don’t reset without turning off power. Electric models can deliver a lethal shock if you’re not careful.
- Don’t use a lighter near gas leaks. If you smell gas, leave the house immediately and call your gas provider. Don’t attempt anything yourself.
- Don’t ignore repeated resets. If the heater resets once, fine. If it resets twice in a week, call a pro. Something’s wearing out.
- Don’t assume it’s broken. Many "dead" water heaters just need a reset. A 2019 study by the National Association of Home Builders found that 63% of reported water heater failures were fixed with a simple reset or pilot relight.
When to Call a Professional
You can reset a water heater yourself-but not everything is DIY. Call a licensed plumber if:- The reset button keeps tripping after two attempts
- You smell gas (even faintly) and can’t relight the pilot
- Water is leaking from the tank or fittings
- The heater is over 10 years old and has never been flushed
- You hear knocking, rumbling, or banging noises
Old units often develop internal rust or sediment buildup that can’t be fixed by resetting. Flushing the tank annually can extend its life by 5-7 years. If yours hasn’t been flushed in 5+ years, that’s likely the root cause.
Prevent Future Problems
Once your heater’s working again, protect it:- Flush the tank once a year. Drain 2-3 gallons through the bottom valve to remove sediment. Hard water areas (like Wellington) need this more often.
- Set the thermostat to 120°F (49°C). Higher temps cause more scale buildup and increase burnout risk.
- Check the pressure relief valve every 6 months. Lift the lever slightly-it should release a small burst of water. If it doesn’t, replace it.
- Install a water softener if you have hard water. It cuts down on mineral buildup that kills heating elements.
Most water heaters last 8-12 years. With proper care, they can hit 15. Skipping maintenance is the #1 reason people replace them early.
Quick Reset Checklist
Keep this handy:
- Electric heater? → Turn off power → Find red reset button → Press → Restore power → Wait 60 mins
- Gas heater? → Turn gas off → Wait 5 mins → Turn dial to pilot → Hold button → Light flame → Hold 60 secs → Turn to on
- Still no hot water? → Check breaker, gas valve, pilot light
- Reset keeps failing? → Call a technician
Why does my electric water heater keep tripping the reset button?
The reset button trips when the water gets too hot-usually because one heating element is stuck on or the thermostat is faulty. Sediment buildup at the bottom of the tank can also cause uneven heating. If the button trips more than once, it’s not a coincidence. You likely need a new thermostat or heating element. Continuing to reset it can damage the tank.
Can I reset a gas water heater without lighting the pilot?
No. Gas water heaters don’t have a reset button. If the pilot light is out, you must relight it manually. If the pilot won’t stay lit after several attempts, the thermocouple is probably worn out and needs replacement. Trying to bypass this with a different method is unsafe and won’t work.
Is it safe to reset a water heater if I smell gas?
No. If you smell gas-even a faint odor-leave the house immediately. Do not turn lights on or off, use phones, or attempt any reset. Call your gas company from outside. Gas leaks can lead to explosions. Never try to fix a gas leak yourself.
How often should I flush my water heater?
At least once a year. In areas with hard water-like Wellington-it’s better to do it every 6 months. Sediment buildup reduces efficiency, causes noise, and shortens the life of the heating elements. Flushing takes 20 minutes and costs nothing. It’s the single best maintenance task you can do.
My water heater is 12 years old. Should I reset it or replace it?
If it’s 12 years old and just stopped working, try resetting it. But don’t expect it to last long after. Most water heaters fail between 8-12 years. If you reset it and it works, plan to replace it within the next 6-12 months. Older units are less efficient, leak more often, and cost more to repair than replace.
