How to Safely Light a Whirlpool Water Heater

The Short Version

• Check for gas smells: Sniff around the base of the tank and across the floor. If you detect a rotten egg odor, do not strike a spark. Turn off the gas and leave immediately.
• Set the controls: Turn the temperature dial to its lowest setting, align the gas control knob with the PILOT mark, and press the knob down firmly.
• Click the sparker: While holding the gas knob down, press the push-button sparker once every second until a small blue flame appears through the viewing glass at the bottom.
• Warm the sensor: Keep holding the gas knob down for 30 to 60 seconds after the flame catches. Release it slowly, turn the knob to ON, and adjust your temperature dial.

Before You Strike a Spark: The Gas Safety Check

Before touching any dials, pause and use your nose. Water heaters run on natural gas or propane, and fuel providers add a chemical called mercaptan that smells like rotten eggs or sulfur. Sniff the air around the tank, especially near the floor. Propane is heavier than air and settles near the base of the heater. Natural gas is lighter and rises, but it can still gather in closed utility spaces.

If you smell gas, stop immediately. Do not push any buttons, do not flip light switches, and do not use a phone near the heater. Shut off the manual gas valve on the supply pipe, leave the house right away, and call your gas utility company or fire department from outside.

If the air smells clean, run through this quick safety checklist before lighting:

• Check the manual gas valve: Look at the rigid metal pipe leading to the heater. The shutoff handle must align parallel with the pipe. If the handle points across the pipe at a right angle, the gas supply is shut off.
• Wait for fumes to clear: If you tried lighting the heater a few minutes ago, unburned gas can pool in the burner chamber. Wait 10 minutes with the control knob set to OFF so trapped fumes clear.
• Clear the floor area: Move cardboard boxes, laundry baskets, and cleaning supplies at least 3 feet away from the tank. The heater needs unobstructed airflow along its base to feed the flame clean oxygen.

How to Light the Pilot Flame: Step-by-Step Instructions

Modern Whirlpool gas water heaters use a sealed burner chamber to keep open flames away from household dust. You will operate everything from the outside using the gas control box on the front of the tank. You do not need matches or tools.

1. Turn the temperature dial down: Turn the temperature dial counterclockwise to VACATION or LOW. This prevents the main burner from roaring to life with a rush of heat while you are still working on the starter flame.
2. Align the gas knob with PILOT: Press slightly inward on the main gas control knob and turn it until the word PILOT aligns with the indicator notch on the plastic housing.
3. Press and hold the PILOT knob: Push the knob straight in with your thumb. Holding this knob down forces an internal valve open, sending a small stream of gas directly to the starter nozzle.
4. Click the push-button sparker: Keep your thumb pressed down hard on the gas knob. With your other hand, push the push-button sparker (the piezo igniter button next to the knob). Press it until it makes a sharp click. Click it once every second, four or five times in a row.
5. Look through the viewing glass at the bottom: Crouch down and look through the small sight glass near the floor on the metal door. You will see a small spark jump, followed by a tiny blue flame at the tip of the metal tube.
6. Hold the knob down for 30 to 60 seconds: Once the flame catches, do not let go of the knob. Keep holding it down for a full 30 to 60 seconds so the internal safety parts can heat up properly.
7. Release the knob slowly: Ease your thumb off the PILOT knob. Look through the viewing glass to confirm the flame stays lit. If it goes out, turn the knob to OFF, wait 10 minutes, and try again.
8. Turn the gas knob to ON: Rotate the control knob counterclockwise to ON.
9. Set your water temperature: Turn the temperature dial clockwise to your desired warmth, usually around 120 degrees Fahrenheit (marked HOT or position B). You will hear a quiet whoosh as the main burner ignites.

Why the Flame Goes Out When You Let Go (The Safety Heat Sensor)

The most common problem homeowners run into is watching the starter flame burn nicely while holding the knob, only to see it vanish the second they let go. This is not a fuel clog. It is an intentional safety feature designed to protect your home from gas leaks.

Right beside the flame sits a small metal rod known as the safety heat sensor (often called a thermocouple). When the flame bathes this sensor in heat, the metal produces a tiny electrical current, measuring about 20 to 30 millivolts.

That electrical current travels through a copper line to an electromagnet inside the gas control box. As long as that magnet receives current, it holds the internal gas valve open so fuel flows freely to the flame. If the flame blows out, the sensor cools down within seconds. The electric current stops, the magnet drops its hold, and an internal spring slams the gas valve shut. This stops unburned gas from leaking into your home.

When you hold the PILOT knob down, you are physically forcing that valve open with thumb pressure. If you release the knob after only a few seconds, the sensor has not warmed up enough to produce electrical current. The valve snaps shut, and the flame dies. Holding the knob down for 30 to 60 seconds gives the metal sensor enough time to reach operating temperature.

Troubleshooting: What to Do If the Pilot Will Not Catch

If you clicked the sparker several times and no flame appeared, turn the gas knob back to OFF. Check these common culprits before calling for service:

• Trapped air in the gas line: If your gas was shut off recently, or if the water heater sat unused, the supply pipe contains air. Turn the knob to PILOT, hold it down firmly for 1 to 2 minutes without clicking the sparker to bleed out the air, and then try lighting it again.
• A loose sparker wire: Check behind the spark button on the bottom of the control box. A thin wire runs from the button to the burner assembly. If that wire slipped off its terminal prong, push the metal connector back onto the prong.
• A dirty air intake screen: Whirlpool water heaters pull combustion air through a metal filter screen under the base of the tank. Household dust, pet hair, and lint collect there over time. When airflow is blocked, the flame starves for oxygen and dies. Clean the screen around the base with a soft vacuum brush.
• Drafts in cold utility areas: Strong air currents can blow out a fragile starter flame before the sensor warms up. If your tank sits in an unheated garage, using a garage heater with a built-in thermostat helps stabilize ambient temperatures, but avoid directing forced air toward the water heater intake vents.
• Manufactured home intake clogs: Water heaters in mobile homes draw combustion air through dedicated pipes under the subfloor. As with safety checks for a heating system for a mobile home, make sure the outside intake pipe beneath your floor is free from dirt, nests, or loose insulation.

When to Stop and Call a Plumber

Lighting a water heater is straightforward, but pushing past persistent warning signs can create serious hazards. Shut off the manual gas valve and call a licensed plumber if you notice any of these signs:

• Ongoing gas odors: If you smell rotten eggs after waiting 10 minutes with the control knob set to OFF, you likely have an active leak in your supply pipe fittings or gas control valve.
• A lazy yellow flame: A healthy starter flame is sharp and blue. If the flame burns bright yellow or orange, the burner is not getting enough air. Incomplete combustion produces dangerous carbon monoxide gas.
• Status light error flashes: Many Whirlpool models have a small green light on the gas control box that blinks once every three seconds during normal operation. If it flashes four, five, or seven times in a row, an internal sensor or safety switch has failed.
• The flame dies after multiple tries: If you held the knob down for a full 60 seconds and the flame went out immediately upon release three times in a row, the safety heat sensor or the control valve electromagnet has failed and needs replacement.

FAQs

Can I use a match to light my Whirlpool water heater?

No, you should never use a match or lighter on a modern Whirlpool water heater. These units feature a sealed combustion chamber to prevent household vapors from catching fire. Prying open the metal access door or breaking the glass seal damages the safety system. Always use the built-in push-button sparker.

How long should I wait between failed attempts to light the pilot?

Wait at least 10 minutes with the gas knob turned to OFF between lighting attempts. Holding down the pilot knob releases raw gas into the burner chamber. Waiting 10 minutes allows lingering gas to vent safely out the chimney flue, preventing a sudden pop when you next strike a spark.

Why does my pilot flame blow out during windy storms?

Strong winds blowing across your roof can force air downdrafts down the exhaust chimney pipe. These air currents can push down into the combustion chamber and extinguish the tiny starter flame. If your water heater frequently goes out during storms, ask a technician to check your flue cap for proper wind protection.

What should I do if the spark button will not click?

If the push-button sparker feels frozen or pushes down without making a loud click, its internal mechanical spring has worn out. Gently tap the plastic housing around the button to see if it frees up. If it still does not snap, the igniter mechanism must be replaced by a qualified repair technician.