Most patio heater problems come down to fuel, ignition, or a clogged burner
A patio heater that won't light or produces weak heat usually has one of three issues: the propane tank is empty or disconnected, the ignition system has failed, or the burner ports are blocked by dust or debris. Before you buy a replacement, you can troubleshoot and fix most of these yourself in under an hour. The repair depends on which part is failing, so start by checking the simplest things first.
Most residential patio heaters are either propane-powered standing models or tabletop units. Both use the same basic components—a fuel line, an ignition button or piezo igniter, and a burner head with small ports that let gas through. When one of these fails, the heater stops working. The good news is that you do not need special tools or certification to fix them.
Key Takeaways
- Check that the propane tank valve is open, the tank is not empty, and the connection is tight before assuming the heater is broken.
- If the heater does not light, clean the burner ports with a thin wire or needle to clear dust and debris that blocks gas flow.
- A dead ignition button can be replaced with a universal piezo igniter kit that costs under $20 and takes 10 minutes to install.
- If gas flows but the flame is weak or yellow instead of blue, the air shutter may be closed—loosen the band clamp to let more air in.
- Call a professional if you smell gas, see a crack in the burner, or cannot locate the problem after checking fuel and ignition.
Verify the propane tank is full and connected
Start here, because an empty or loose tank is the most common reason a heater stops working. Turn off the heater and let it cool for 10 minutes. Check the tank valve—it should be turned fully counterclockwise (open). If it is closed, turn it open and try lighting the heater again.
Next, check whether the tank is empty. Shake it gently; a full tank feels heavy and does not slosh. You can also pour a glass of warm water down the outside of the tank. If one side feels cold to the touch and the other feels normal, the tank still has propane. If both sides feel the same temperature, the tank is empty and needs to be refilled or replaced.
Finally, inspect the connection where the fuel line screws onto the tank. Turn off the tank valve, then use an adjustable wrench to tighten the connection by turning it clockwise. Do not over-tighten—snug is enough. Turn the valve back open and attempt to light the heater. If it still does not work, move on to the ignition system.
Clean the burner ports if the heater does not light
If fuel is reaching the heater but it will not ignite, the burner ports are likely clogged. These are tiny holes in the burner head that let propane gas flow out. Dust, spider webs, and debris block them over time, especially if the heater sat unused during winter.
Turn off the heater and tank valve. Most standing heaters have a burner head that unscrews or unbolts from the top. Check your manual for the exact method, but usually you will remove 2 to 4 bolts or unscrew a collar. Lift the burner head away carefully—do not yank the fuel line.
Use a thin wire, a sewing needle, or a straightened paperclip to poke through each port hole. Work gently; you are clearing blockages, not enlarging the holes. Blow compressed air through the ports if you have a can available. Wipe the burner head with a dry cloth and reinstall it, making sure the fuel line is connected and tight. Try lighting it again.
Replace the ignition button if it does not spark
When you press the ignition button, you should hear a clicking sound and see a small spark near the burner. If you hear nothing or see no spark, the piezo igniter has failed. This is the part that creates the spark when you press the button.
You can buy a universal piezo igniter kit online or at a hardware store for under $20. The kit includes a new igniter button, a wire, and usually a mounting bracket. Turn off the heater and tank, then locate the old igniter button—it is usually mounted on the side or front of the heater body with one or two screws.
Remove the screws and disconnect the wire from the old button. Connect the wire to the new igniter button and screw it into place. Make sure the wire runs safely away from the burner and does not touch any hot surfaces. Turn the tank valve back on and test the button. You should hear clicking and see a spark. If you do, try lighting the heater.
Adjust the air shutter if the flame is weak or yellow
A healthy patio heater flame is blue and steady. If the flame is yellow, orange, or weak, the burner is not getting enough air. This is controlled by the air shutter, a metal band with a slot that wraps around the burner tube below the burner head.
Turn off the heater and let it cool. Locate the air shutter—it looks like a metal collar with a rectangular opening. Loosen the band clamp (usually a single bolt or screw) and rotate the shutter to open the slot wider. This lets more air mix with the gas, which makes the flame burn hotter and bluer. Tighten the clamp and light the heater again.
If the flame is still yellow, loosen the clamp and open the shutter a bit more. Keep adjusting until the flame is mostly blue with just a small amount of yellow at the tip. Do not open it so far that the flame blows out or becomes unstable. Once you find the right position, tighten the clamp firmly so it does not slip.
Check the fuel line for leaks or cracks
If gas is flowing but the heater still will not light, or if you smell gas around the heater, inspect the fuel line. Turn off the tank and let the heater cool completely. Look along the entire length of the rubber or metal tube that runs from the tank to the burner.
A small crack or pinhole leak will not be obvious, so use this test: mix a few drops of dish soap with water in a spray bottle. Spray the entire fuel line while the tank valve is open (but the heater is off). If bubbles form anywhere, there is a leak. A small leak in a rubber line can sometimes be sealed with plumber's tape wrapped tightly around the damaged spot, but a cracked metal line or a large leak means the line needs to be replaced.
Fuel lines are inexpensive and come as complete assemblies. You can order a replacement online or buy one at a hardware store. Turn off the tank, disconnect the old line from both the tank and the burner, and screw the new line into place. Make sure all connections are tight before turning the tank back on.
When to call a professional
Stop troubleshooting and call a professional if you smell gas coming from inside the heater body (not just from the connection), if the burner head has a visible crack, or if you cannot locate the problem after checking the tank, ignition, and burner ports. A cracked burner or an internal gas leak is a safety issue and should not be repaired at home.
You should also call a professional if the heater lights but produces almost no heat even after you adjust the air shutter. This can mean the burner is damaged or the gas pressure is too low, both of which require specialized tools to diagnose and fix. Most patio heater repairs cost between $75 and $150 in labor, which is often less than the cost of a new heater.
Frequently Asked Questions
Can I use my patio heater if the ignition button does not work?
Yes, if you have a long lighter or matches. Light the match or lighter, hold it near the burner ports, and turn the gas valve on slowly. The flame from the match will ignite the gas. This is safe as long as you keep your hand away from the burner and do not rush. Replace the ignition button when you have time, but you can use the heater this way temporarily.
Why does my patio heater keep going out?
Wind is the most common cause. Patio heaters are designed for light breezes, not strong gusts. If you are in a windy spot, move the heater to a sheltered corner or use a windbreak. If the heater goes out even on calm days, the burner ports may be partially clogged or the air shutter may be too open. Clean the ports and adjust the shutter to see if that stops the problem.
How often should I clean the burner?
Clean the burner ports once a year before you use the heater for the season, and again if it stops lighting during the season. If you live in a dusty area or near the ocean, clean it more often. A quick cleaning takes 10 minutes and prevents most ignition problems.
Is it safe to leave a patio heater on all night?
Most manufacturers recommend against it. Patio heaters are designed for a few hours of use at a time. Leaving one on overnight increases the risk of a fuel leak, wind blowing out the flame, or the tank running empty unnoticed. Use the heater while you are outside and turn it off when you go inside.
What does it mean if the flame is orange instead of blue?
An orange or yellow flame means the burner is not getting enough air to burn the gas completely. This is usually fixed by opening the air shutter. If opening the shutter all the way does not make the flame blue, the burner ports may be partially clogged. Clean them with a thin wire and try again.