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Also asked, why does my pilot light go out when it's windy?
5) Improper Air Flow, or a Strong Draft, Blows the Pilot Out If your pilot light re-lights easily after going out overnight, it's possible it was blown out by a draft. This can happen on excessively windy days or nights. A leak in the output duct of the furnace could cause air to blow into the area.
Secondly, how do you adjust the pilot light on a gas furnace? How to Adjust the Pilot Light Flame on a Gas Furnace
- Locate the access plate on the front of your furnace, and unscrew the screws that are connecting the access plate to your furnace.
- Observe the flame.
- Turn that screw counter-clockwise, and the flame should grow.
- Rotate the screw on the pilot light clockwise, and the size of the flame will decrease.
In this way, why does my pilot light keep blowing out?
Pilot light blows out. The most common and well-known problem with pilot lights is that the flame can blow out. Sometimes this can happen simply due to a strong draft nearby. Other times, the thermocouple in your furnace might manually shut off the pilot light for safety reasons.
Why does the pilot light keep going out on my gas furnace?
If your furnace pilot light keeps going out, it's likely you have a broken thermocouple in your gas furnace. The thermocouple is a rod that comes into physical contact with the flame in your system. When this component is not able to detect the flame, it will close the gas valve to prevent a gas leak in your home.
Related Question Answers
Should the pilot light always be on in a gas furnace?
If you have an older gas furnace, your heating unit relies on a little blue flame known as a pilot light to ensure ignition of the burners. Water heaters, gas fireplaces and old gas stoves also often have similar pilot lights. Since the pilot light needs to remain active, your furnace is always consuming some gas.How long should a thermocouple last?
The thermocouple unwinds and switches on the fireplace. Thermocouples are rigorously tested and should last for years. Indeed, experts believe a four-year check cycle is all that is needed to make sure things are functioning properly.How do you know if you have a bad thermocouple?
If you can't get the flame to light at all, and you're sure the gas is on, there's probably an obstruction in the pilot tube. If the flame lights and goes out when you release the gas control knob after holding it in for the recommended 20 to 30 seconds, that's the sign of a thermocouple malfunction.How do you test a thermocouple?
Steps - Locate the pilot light controls on the gas valve.
- Turn the pilot light on for 30 seconds.
- Release the button to see if the pilot light goes out.
- Turn off the gas supply to test the thermocouple again.
- Count to 20 and wait for the pilot light to go out.
- Listen for clicking near the gas valve.
What does a thermocouple look like?
The thermocouple looks like a piece of metal tubing smaller than a soda straw. To find it, first locate the gas control box. This is the box that the main gas line enters, where you turn the gas on in the furnace. The other end of the thermocouple sits in the flame of the pilot light.How much does it cost to replace a thermocouple?
Thermocouple Replacement - $20-$150Calling a professional plumber to install a new thermocouple should only be up to $150. If you do the work yourself, you will only pay the price of the part which is about $20.Can you clean a thermocouple?
If the Thermocouple is faulty it will cause the unit to shut down. How to clean? Remove Thermocouple from pilot assembly, using steel wool or emery cloth to lightly clean the tip removing any soot or build up that might have accorded due to an improper pilot flame.Is it dangerous if a pilot light goes out?
Faulty thermocouple.If your pilot light repeatedly goes out, this is a likely culprit. If this flame sensor should fail, gas will continue to flow even after the pilot light has been extinguished, causing a safety hazard, and requiring immediate repair.How much does it cost to replace a thermocouple on a furnace?
Cost to Replace a Thermocouple on a FurnaceReplacing a thermocouple costs $150 to $250, mostly due to labor time. On older models without an ignitor, it checks to make sure your pilot light is lit. If it's not, it'll shut the gas off.Can a pilot light flame be adjusted?
Adjusting the Pilot FlameIf the pilot flame is too small, you may be able to make it larger by turning the pilot adjustment screw on the valve control counterclockwise with a screwdriver to open it. The cause of a weak flame may also be an obstruction in the pilot tube.What should a furnace pilot light look like?
A proper pilot flame should be blue with a yellow tip and should be strong enough to cover about 1/2 inch at the end of the thermocouple tip. If the flame is too strong and improperly adjusted, it will be blue but may be noisy and lift off the thermocouple, causing improper furnace operation.What causes a thermocouple to fail?
Changes in temperature can cause regular expansion and contraction in metal, which will cause thermocouples to weaken over time. After enough time, metal fatigue can cause a thermocouple to break. If thermocouples start to give out unusual readings, it may be suffering from metal fatigue.Should a thermocouple be in the flame?
Typically the thermocouple sensor is mounted right in the flame of the pilot light on gas fired heating equipment. But not all of these systems use a thermocouple. Some gas fired heating equipment relies on an electronic ignition to ignite the flame. Those devices generally will not use a thermocouple.What color should the flame on a gas fireplace be?
A healthy gas flame will burn steadily with a yellow or orange. If the flame is not yellow or orange it may be a sign that your gas fireplace needs adjusting or cleaning, which should be done by a qualified technician, such as those we have at Kozy Heat.Why does my pilot light go out when I release the pilot light knob?
The most likely of those is that the thermocouple needs to be replaced. The button you press to light the pilot bypasses the thermocouple. When you release the button, the thermocouple ensures that unburned gas doesn't get released by shutting off the gas when it's not heated by the burning pilot light.How do you reset the pilot light on a furnace?
Once the gas has had time to dissipate, turn the knob to "Pilot." Then, hold down the "Reset" button and bring the flame of a long lighter close to the pilot light opening. This should light the furnace pilot light. Once you are sure the pilot light is on, release your pressure on the reset button.How do you clean a thermocouple on a furnace?
Use a screwdriver to loosen the screws and remove the thermocouple from the pilot assembly for cleaning. Use a piece of steel wool or the abrasive side of a sponge to gently remove the soot without damaging thermocouple. Avoid using cleaning products, especially those containing flammable chemicals.Should furnace pilot light always on?
If you have an older gas furnace, your heating unit relies on a little blue flame known as a pilot light to ensure ignition of the burners. Water heaters, gas fireplaces and old gas stoves also often have similar pilot lights. Since the pilot light needs to remain active, your furnace is always consuming some gas. 
Matthew Cannon 
