Question about Air Conditioners
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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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
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