. 15935 Answers SOURCE: The steps involved can vary slightly depending on your furnace model and pilot valve type, so if possible try and find the instructions inside the furnace door cover or in the instruction manual. This is for a gas fired furnace, but applies to any gas-fueled appliance including water heater. Two of the most common types of pilot valve body assemblies either have a red reset button and a gas valve or no reset button and a valve knob that can be depressed. But whichever type you've got, if you have an older model furnace with a standing pilot (flame is lit all the time) then this is the basic procedure. Turn you thermostat to 80 degrees or to a setting that will demand heat. Make sure the thermostat is in 'Heat' mode.
Go to the furnace and find the pilot valve. The pilot valve body is a box shaped device into which the main gas line will run and is located near the gas burners. It will usually have a gas. or valve knob that reads 'On, 'Pilot' and 'Off.' Locate this gas. or knob.
Turn the knob or gas. to the 'Off' position and wait about 3 minutes for any residual gas to clear away. Find the pilot. It's located near the gas burner tube assembly in the furnace. Get your match or lighter ready.
Sometimes the pilot is hard to reach. If possible, try and use a long fireplace match when you light it. If you don't have a fireplace match then a butane BBQ grill lighter works well too. If you don't have that, then you can fasten a match to the end of a stick when you light the pilot.
If you have a pilot with a red Reset button, turn the gas valve from 'Off,' to 'Pilot.' . If you have a pilot with no red button, turn the knob from 'Off' to 'Pilot.' . Place the lit match or ignited lighter tip at the pilot and depress and hold the button or depress the knob as appropriate. Depress the button or knob for about 30 seconds.
This maintains gas flow to the pilot until the thermocouple gets hot enough to open the main gas valve. Once the pilot stays lit, slowly release the button or knob and turn the gas. or knob from the 'Pilot' position to the 'On' position. This will ignite the burners and keep the flow of gas supplied as required for the burners as called for by the thermostat. If the burners fail to ignite then it may be because the thermocouple did not get hot enough to open the gas valve. Wait a few minutes and then repeat the above procedure. This time hold the red reset button or depress the knob for about 45-60 seconds.
Once the main furnace burners ignite, adjust the thermostat to the desired setting. If you've followed the previous steps on lighting the pilot and it still does not light after, or will not stay lit, then you probably have a problem with the thermocouple or an adjustment needs to be made to the pilot. You'll need a furnace service technician to replace or repair these parts. You may find that the pilot lights, but it is an anemic looking flame.
That's a different problem we'll look at in the next section. If the pilot lights but the flame is a weak yellow flame, it will not get hot enough to heat the thermocouple to its set point allowing the gas valve to open. A natural gas flame should be a bright blue with the tip of the flame having just a tinge of yellow.
A propane flame should have a bluish green flame with a tinge of yellow at the tip. The flame should be strong enough to hit the thermocouple tip about 1/2 inch from the tip end. If the flame is weak or shaky looking, check to see that a breeze or draft is not blowing on it. Adjusting the Flame There is usually a small screw on the pilot valve body that will adjust the flame. You may have to refer to the manufacturer's instructions to find the screw. Turn the screw as needed to adjust the flame throw.
Yellow Flame A yellow flame is caused by lack of air and incomplete combustion. It can be caused by a dirty pilot tube tip. Split Flame This is caused by dirt in the pilot tube.
Take a needle or small nail and gently clean the tube. Flickering or Wavering Flame A flame that flickers is usually caused by a draft. Thanks for using FixYa - a FixYa rating is appreciated!!
Posted on Feb 18, 2009. It could be that the safety ($150 to $250) is getting old, or grease filled. It could also mean the thermocouple ($7 to $12) is going bad, or has a bad connection. If the copper jacket of the thermocouple is blackened near the pilot, broken or cracked in anyway, it may not be working properly, as it generates a small voltage when heated, less than100th of an AAA battery, to keep your pilot lit. If the pilot orfice is clogged with dust it produces a smaller, less hot flame, which also lowers the output of the thermocouple. If I was performing the service, you would automatically get a pilot cleaning, and a thermocouple, the safety could still be bad, and confirming this is a 50/50 chance to begin with, but it is a cheaper start. Good luck, ask more if you need too, thank you, an Happy New Year.
Dec 27, 2008.
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F2 Gas Mask
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The Gas Boilers Behind The Spares There are a wide range of gas boilers available in the UK and they are split into three main categories.
. 15935 Answers SOURCE: The steps involved can vary slightly depending on your furnace model and pilot valve type, so if possible try and find the instructions inside the furnace door cover or in the instruction manual. This is for a gas fired furnace, but applies to any gas-fueled appliance including water heater. Two of the most common types of pilot valve body assemblies either have a red reset button and a gas valve or no reset button and a valve knob that can be depressed. But whichever type you've got, if you have an older model furnace with a standing pilot (flame is lit all the time) then this is the basic procedure.
Turn you thermostat to 80 degrees or to a setting that will demand heat. Make sure the thermostat is in 'Heat' mode.
Go to the furnace and find the pilot valve. The pilot valve body is a box shaped device into which the main gas line will run and is located near the gas burners. It will usually have a gas. or valve knob that reads 'On, 'Pilot' and 'Off.' Locate this gas. or knob. Turn the knob or gas.
to the 'Off' position and wait about 3 minutes for any residual gas to clear away. Find the pilot. It's located near the gas burner tube assembly in the furnace. Get your match or lighter ready. Sometimes the pilot is hard to reach.
If possible, try and use a long fireplace match when you light it. If you don't have a fireplace match then a butane BBQ grill lighter works well too. If you don't have that, then you can fasten a match to the end of a stick when you light the pilot.
If you have a pilot with a red Reset button, turn the gas valve from 'Off,' to 'Pilot.' . If you have a pilot with no red button, turn the knob from 'Off' to 'Pilot.' . Place the lit match or ignited lighter tip at the pilot and depress and hold the button or depress the knob as appropriate. Depress the button or knob for about 30 seconds. This maintains gas flow to the pilot until the thermocouple gets hot enough to open the main gas valve.
Once the pilot stays lit, slowly release the button or knob and turn the gas. or knob from the 'Pilot' position to the 'On' position. This will ignite the burners and keep the flow of gas supplied as required for the burners as called for by the thermostat. If the burners fail to ignite then it may be because the thermocouple did not get hot enough to open the gas valve. Wait a few minutes and then repeat the above procedure. This time hold the red reset button or depress the knob for about 45-60 seconds.
Once the main furnace burners ignite, adjust the thermostat to the desired setting. If you've followed the previous steps on lighting the pilot and it still does not light after, or will not stay lit, then you probably have a problem with the thermocouple or an adjustment needs to be made to the pilot. You'll need a furnace service technician to replace or repair these parts.
You may find that the pilot lights, but it is an anemic looking flame. That's a different problem we'll look at in the next section. If the pilot lights but the flame is a weak yellow flame, it will not get hot enough to heat the thermocouple to its set point allowing the gas valve to open. A natural gas flame should be a bright blue with the tip of the flame having just a tinge of yellow.
A propane flame should have a bluish green flame with a tinge of yellow at the tip. The flame should be strong enough to hit the thermocouple tip about 1/2 inch from the tip end.
If the flame is weak or shaky looking, check to see that a breeze or draft is not blowing on it. Adjusting the Flame There is usually a small screw on the pilot valve body that will adjust the flame. You may have to refer to the manufacturer's instructions to find the screw. Turn the screw as needed to adjust the flame throw. Yellow Flame A yellow flame is caused by lack of air and incomplete combustion. It can be caused by a dirty pilot tube tip. Split Flame This is caused by dirt in the pilot tube.
Take a needle or small nail and gently clean the tube. Flickering or Wavering Flame A flame that flickers is usually caused by a draft. Thanks for using FixYa - a FixYa rating is appreciated!!
Posted on Feb 18, 2009. It could be that the safety ($150 to $250) is getting old, or grease filled. It could also mean the thermocouple ($7 to $12) is going bad, or has a bad connection. If the copper jacket of the thermocouple is blackened near the pilot, broken or cracked in anyway, it may not be working properly, as it generates a small voltage when heated, less than100th of an AAA battery, to keep your pilot lit. If the pilot orfice is clogged with dust it produces a smaller, less hot flame, which also lowers the output of the thermocouple. If I was performing the service, you would automatically get a pilot cleaning, and a thermocouple, the safety could still be bad, and confirming this is a 50/50 chance to begin with, but it is a cheaper start. Good luck, ask more if you need too, thank you, an Happy New Year.
Dec 27, 2008.
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