The pilot light on a gas water heater is a small but essential component that ignites the burner to heat water. When the pilot goes out, you may notice no hot water or a gas smell. This guide provides practical, step-by-step instructions to light a pilot light safely, along with troubleshooting tips and when to seek professional help. It covers common models, safety considerations, and best practices for both older standing-pilot and newer hot-surface ignition units.

Overview Of Gas Water Heaters And Pilot Lights

A gas water heater relies on a pilot light or electronic ignition to ignite the main burner. Standing-pilot models have a constant flame, while newer units use an electronic ignition system that may not require a standing pilot. Understanding your model helps determine the correct lighting procedure and safety steps. If you smell gas, evacuate the area and call the gas company or emergency services immediately.

Safety Precautions

Turn off the gas supply or set the control to the off position before inspecting the burner area.
Ventilate the area to avoid gas buildup; never light a match or use electrical switches if a gas odor is present.
Read the water heater’s manual for model-specific instructions and warnings.
Have a flashlight handy; do not use lighters or matches near the unit when checking the pilot area.
If the pilot won’t stay lit after repeated attempts, or you smell strong gas, contact a licensed plumber or the gas utility for inspection.

Tools And Materials You May Need

Owner’s manual or model number of the water heater
Non-flammable gloves
Long lighter or long matches (only if recommended by the manual)
Flashlight for visibility inside the access panel
Screwdriver (flat or Phillips, as required by the unit)
Soap and water (to test for gas leaks at connections)
Mouth-to-flame precautions are not recommended; follow manual guidelines.

Step-By-Step Guide To Light The Pilot Light

Note: Steps vary by model. Always consult your owner’s manual for exact instructions. Below is a general procedure for older standing-pilot gas water heaters.

Access the control panel: Remove the access or service panel on the side of the water heater to reveal the gas control valve and burner area.
Turn the gas control to Off: Wait at least 5 minutes to let accumulated gas disperse before relighting.
Open the gas supply: Ensure the gas valve is fully open. Some models require you to press and hold the reset or pilot button.
Ignite the pilot: If your unit has a standing pilot, locate the pilot flame area. If your manual allows, use a long lighter or built-in igniter to ignite the pilot. If your model uses a piezo push button, press and hold the knob while lighting the pilot.
Hold and confirm the pilot: Keep the control knob depressed for 30 seconds after the flame lights to heat the thermocouple and establish a steady flame.
Release and set to On: After confirming a steady pilot flame, release the knob and turn the gas control to the On position. Replace the access panel securely.
Test hot water: Run a faucet to confirm the system heats normally. If there is no hot water or the pilot goes out, turn the gas off and consult the manual or a professional.

Lighting A Pilot Light On Models With Electronic Ignition

Newer water heaters may use an electronic ignition rather than a standing pilot. If you notice a lack of heat and no pilot flame, perform these checks:

Ensure the power to the water heater is on and the thermostat is set to an appropriate temperature (typically 120–140°F).
For direct-vent or sealed-combustion units, confirm venting is clear and unobstructed.
Follow the manufacturer’s reset procedure if available. Some units require turning the gas control to Off, waiting, then returning to Pilot or Ignition and pressing a reset button.
If ignition fails repeatedly, contact a licensed technician to inspect the igniter, thermocouple, and gas valve integrity.

Troubleshooting Common Issues

Pilot Won’t Light: Ensure gas supply is on, check for gas odor, and verify the control valve is in the correct position. Clean any dirt around the burner and pilot assembly if accessible.
Pilot Lights But Goes Out: A weak or dirty thermocouple can cause shutdown. Clean or replace the thermocouple if you’re comfortable, otherwise contact a pro. Ensure proper flame height and stability.
No Hot Water After Lighting: Confirm thermostat setting and heating element operation. If the burner runs but water doesn’t get hot, the dip tube or burner assembly may be clogged or the tank may be undersized for demand.
Gas Odor Persisting: Evacuate, avoid switches, and call the gas company immediately. Do not attempt to relight until cleared by a professional.
Ignition System Issues: Electronic ignitors can fail; inspection may reveal cracked or dirty components. Replacing the igniter or module might be needed.

When To Call A Professional

Repeatedly lighting issues or failed ignition despite following steps.
Persistent gas smell or leak suspicion at any fittings or pipes.
Water heater shows signs of malfunction beyond simple pilot lighting, such as inconsistent water temperature, unusual noises, or corrosion.
Unit is older than 15–20 years or you’re unsure about safety protocols.

Additional Tips For Safe And Efficient Operation

Regular maintenance improves reliability; inspect the burner and flame visually for a steady blue flame with minimal yellow tips.
Test the thermostat annually and adjust to the recommended range for energy efficiency and comfort.
Keep the area around the water heater clear of flammable materials and clutter.
Consider upgrading to a modern electronic ignition model for fewer manual steps and improved safety features.
Note the unit’s serial number and model information for quick reference when seeking help or replacement parts.