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Re: pilot light will not stay lit
Will it stay lit for a while? If so light the pilot light, Turn on the blower fan, and watch the pilot light. Look for any air that's blowing the pilot light around. if the pilot lite is moving around then you could have a bad heat exchanger. If so you should get a carbonmonixide detector and have your furnace inspected for this. One thing to check also is make sure the thermocouple is at least 1/4 inch into the flame.
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Newer furnaces do not have a pilot light. If yours does, you will have to relight it. Find the gas valve inside the furnace and follow the lighting directions. Generally, you turn the valve to the pilot position, press a button and hold it while you light the pilot. Hold it for about a minute and then release. If the pilot stays lit, then you can go ahead and set the thermostat to call for heat. If it does not stay lit, or the furnace still will not light, I think you need to call a repairmen or someone with knowledge of how to troubleshoot the problem.
Try cleaning the thermocoulpe. If its dirty and sooty no enough heat gets to it and the pilot won't stay on. Also make sure its aime inside the hottest part of the flame. The small blue tip of the flame.
Try cleaning the thermocouple tip if you can see ashes or any buildup on it. If you know the wind isn't blowing it out (had mine blow out from high winds before) then I would change the thermocouple before anything else.
Is this an older furnace where you have a pilot light? Are you saying the pilot light will not stay lit? If thats the case then likely you need a new thermal couple. That is what the pilot light keeps hot while it stays lit. It is a safety device that is there so your furnace will not come on if there is no pilot light present. Very common. Hardware store item. Need Furnace's make and model #'s. If this is an electronically controlled furnace, you will need a service call.
Is that pilot automatic? If so then a quick easy fix for this is to located the sensor and replace it or clean it up with sand paper. After ignition the control is looking for verification of ignition from that sensor. How to videos
take out the pilot assembly. there is a small burner and an orfice. the orfice does get clogged if it has not been operated for awhile. you can clean it out with a small sewing needle. if the pilot wont light or stay lit, replace the thermocouple.