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Pilot light on my heating is lighting but once i take my finger off it goes out

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You likely have a bad thermocouple. Go to a hardware store and pick one up. You will need to shut off your furnace and remove the little copper wire that goes into your gas valve where you are holding down the button to light the pilot. Don't remove the larger silver tube that is for your pilot valve to supply the gas to the pilot.  Follow the copper line and try to pull straight down out of the pilot assembly and it may slide right out. If it doesn't you will need to remove the pilot assembly so go ahead and remove the larger silver tube from the gas valve as well. Take out the one or two screws mounting the pilot assembly usually a 1/4 inch or 5/16 nutdriver should be the proper tool.  Once removed unscrew the thermocouple and put in the new one. Reassemble. Careful not to bend your silver pilot tubing too much otherwise you will need to replace that as well. Always check for gas leaks around your pilot tube after reinstalling parts. 

Posted on Nov 24, 2008

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I light the pilot light, hold it till it stays on by itself, it starts to heat up, and then when its about to switch over to commence full heating the pilot light goes out.


Evidently when the flame comes on, it is pulling the flame away from the pilot thermocouple. You may need to take a small brush and clean your pilot assembly, then take the thermocouple off and replace it. You can also use compressed air to clean the pilot if that is available.

Jun 24, 2011 | Air Conditioners

1 Answer

The pilot light on my daughter's Worcester 240 combi rsf has gone out - how does she re-ignite it?


Hi, I looked up this unit for you and found out it is a hot water system. She needs to get to the main gas valve to light the pilot. This unit has what is called a thermocouple on it that keeps the pilot on, even when the boiler shuts down. Its just a matter of lighting the pilot light. There should be a metal plate with the directions on it at the gas valve to lite it. You will have a knob, more then likely red or black in color on top of the valve. It will say on, off, and pilot. It should be in the on position now. Turn it to pilot. Have some matches with you and a flashlight if you can. You will need to look back into the burner area to where your pilot light will be. The thermocouple is a copper colored tubing that runs right back to the pilot, as it has to get hot from the pilot flame to work. To start, depending on how far back you have to reach with the match, you may need to use a piece of solid cardboard rolled up, a small piece to light it and reach in. Turn the knob to pilot. Now, push down on the knob and hold it down. This lets gas get back to the pilot, so you must keep it down and light it at the same time. Once it is lite, you have to hold it down for at least a minute. Slowly release it, very slow. The flame should then stay on. Once it is on, turn the gas knob to on. With the thermostat set to come on, it will fire up and heat the water. If the pilot will not stay lite after you hold it down for 1 minute, and keeps going out, the thermocouple will need to be replaced. It is the copper line that screws into the gas valve and goes back to the pilot. You can get them at any hardware store for around $6.00. Maybe you can help her install it. It is very simple to do. I believe the pilot just blew out and she will need to light it. Just follow what I have told you, and she will get it lite. Good Luck to you.
Shastalaker7
A/C, & Heating Contractor

Apr 10, 2011 | Air Conditioners

1 Answer

Can't light a vulcan heritage gas heater, the pilot light lights, but as soon as I try to lift my finger off the button to ignite the heater, the pilot flame always goes off.


Hi and welcome to FixYa, I am Kelly.

What you are experiencing is the lack of a signal from the thermocouple to the gas valve. I.e. the thermocouple is not passing heat information at all. This is caused by either a defective thermocouple, a dirty mating area where the thermocouple connects to the gas valve or... an improperly positioned thermocouple that is not "in the flame" with the pilot lit.

  • First make sure the FIRE end of the thermocouple is in the flame when lit. (reposition if necessay)
  • Next disconnect the thermocouple by unscrewing the fitting on the top of the gas valve. (No gas will come out) Clean the metal mating area as best you can and then re-install the thermocouple. Just a good snug fit. Once you feel it come snug add 15 degrees of tightening motion with a wrench.
Attempt to light the pilot... wait 45 seconds to 1 minute while holding the pilot button down before letting it up. If it stays lit.... GOOD JOB. If it goes out the next step is to replace the thermocouple. If after replacing the thermocouple it does not stay lit the remedy is to replace the gas valve. There are no short cuts and the sequence of repairs is just as I stated in order.

You can remove your old thermocouple and walk in to almost any appliance parts supply or Plumbing and heating supply to purchase the correct thermocouple without a part number. They will match it up with yours.

Thanks for choosing FixYa,
Kelly

Feb 20, 2011 | Air Conditioners

1 Answer

I have switched my unit over to heat and only cool air blows out. Is there a reset button I can try before calling out a repair man.


It depends on what type of unit you have if it is gas or electric. If it is gas your pilot light is probably not lit .take the top door of your furnace off look under the burner and see if there is a small flame lit . if not it is simple to light turn the knob on the gas valve to pilot then push in on the know while holding a match at the pilot head to find the pilot head trace the small aluminuim pipe from the gas valve to where it ends that will be the pilot head once the pilot lights count to 10 slowly then switch the knob to the on position and your set make sure the t-stat is in the off position before lighting the pilot light.

If it is electric heat strips or a heat pump there is nothing to do other than turn t-stat to heat and make sure all 220 breakers are in the on position.

Nov 16, 2010 | Weather King Air Conditioners

1 Answer

I have a Rheem gas furnace, model # RGAA-100C and need help lighting the pilot. The instructions on the metal plate tell me to set the valve to off, then to pilot, push the valve down until lit, and then...


Hi, follow what I say and it is very easy. The knob that says off, on, and pilot, is where you need to start. You don't want to turn it off now, as its been off for awhile now. Turn the knob slowly pushing down on it until you fill it go down. The knob will go down believe me. When this happens, keep holding it down as this is what starts the gas to the pilot which is back under the burner, under it. Just take a flash light and you can follow the aluminum tubing back and where it stops is where you light it with something long with a match in it or a small rolled up paper. Keep the knob down the whole time you are lighting it. When it lights, keep the knob pushed down for about another minute. Then slowly release the knob and the pilot should stay on. Once you have it on, turn the knob to on, not off. If you turn it the wrong way, it will go off and you will need to start over again. Once it stays on by itself, turn your thermostat up for heat and the burner will light and come on. Just remember that the pilot where you light it is where the tubing goes back under it, as the pilot gas goes through it. You will need a light. Look at the knob with a good light and it will tell you which way to turn it. In the pilot position, the knob will press down to let the pilot gas in, and you can reach back and light it. Then turn knob on. Pilot should stay light. Turn on thermostat and it will fire up. Let me know how it goes. You may have to try a couple of times.
Sincerely,
Shastalaker7
A/C, & Heating Contractor

Oct 05, 2010 | Air Conditioners

1 Answer

We have an intertherm heating system, its probably 30 or more years old, and we cant see a pilot light, and we havn't been able to light it. the model is mac 1175.


The pilot light jet may have got a little bit of dirt or grit in it which is preventing it from keeping alight. Try probing the jet with a fine piece of wire to see it the blockage can be dislodged. You may have to unscrew the jet to clear it by blowing air through it. Make sure gas is turned off first before removing any parts.

The pilot light also has a thermocouple that allows gas to the pilot light while the flame is burning. If flame goes out it shuts gas off to the pilot jet. The thermocouple is bypassed by a switch during the initial ignition and once the thermocouple warms up after a minute or two of holding in the bypass switch, it should maintain the pilot. If, after cleaning, the pilot light keeps going out, it would seem that your thermocouple is faulty and needs to be replaced

Sep 27, 2010 | Intertherm Air Conditioners

1 Answer

Need to know how light pilot


First step turn the thermostat off. It is very important.
Next find the knob on top of the gas valve you will see writing on it turn it to pilot it could be in the off position so move it to pilot depress the knob where it goes down about one inch. Take a long lighter long match or something like that and hold at the pilot it will be back in the furnace by the front of the burners. Once the pilot lights hold the button for another 30 seconds. Release the knob now the pilot should be on and the next step is why you turned off the thermostat rotate the knob to on position. Go to the t-stat and turn on the heat.

Nov 27, 2008 | Air Conditioners

1 Answer

Pilot light lightin but going out once i take my finger off


You likely have a bad thermocouple. Go to a hardware store and pick one up. You will need to shut off your furnace and remove the little copper wire that goes into your gas valve where you are holding down the button to light the pilot. Don't remove the larger silver tube that is for your pilot valve to supply the gas to the pilot.  Follow the copper line and try to pull straight down out of the pilot assembly and it may slide right out. If it doesn't you will need to remove the pilot assembly so go ahead and remove the larger silver tube from the gas valve as well. Take out the one or two screws mounting the pilot assembly usually a 1/4 inch or 5/16 nutdriver should be the proper tool.  Once removed unscrew the thermocouple and put in the new one. Reassemble. Careful not to bend your silver pilot tubing too much otherwise you will need to replace that as well. Always check for gas leaks around your pilot tube after reinstalling parts. 

Nov 24, 2008 | Air Conditioners

1 Answer

I need to know how to light the pilot on my somewhat old water heater. The model is called the challenger 5 the model number 153.331471


On these older gas water heaters there is a gas control with temperature selection and below that is a removable cover. Once you remove the cover you can gain access to the pilot. You must rotate the knob on the top of the control to the pilot position. When in the pilot position, hold the red button down and light the pilot. Continue to hold the button down after the pilot is lit for about one minute. If when you release the red button the pilot goes out, try one more time. If it goes out again after releasing the button your thermocouple is bad and must be replaced. The thermocouple generates a millivolt electrical current that hold the gas valve in the operating condition when the pilot is lit. When the pilot goes out there is no heat to generate this small electrical field.

Jun 08, 2008 | Kenmore Air Conditioners

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