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Most often, this is a faulty thermocouple. Replace it, but first be sure the pilot flame is actually heating the thermocouple. If it is not, it will not stay lit. Sometimes they fall down out of it's holding bracket or just go bad. A lazy yellow pilot flame means the pilot orifice is dirty and needs to be cleaned. If the pilot flame is a string blue color, then replace the thermocouple.
When troubleshooting a balky pilot, ensure you don't allow any unburned gas to build up!
Usually a problematic pilot is due to a faulty thermocouple. The thermocouple is a safety device designed to interrupt the flow of gas if the pilot light goes out. When lighting the pilot, you usually have to hold a button in to bypass the thermocouple until the flame heats up the thermocouple and it can allow the passage of gas.
Try replacing the thermocouple - a universal can usually be had for under $10.
Thermostat flame sensor. Do you see a little rod next to the pilot? That is what tells the main gas valve that the pilot is lit and it is safe to give gas. Easy swap, and you can usually just pick up a generic one.
The pilot assembly may need cleaned out and the orifice cleaned, also the gas valve may need to be replaced, to check for proper voltage from the thermocouple you need a flame source and it takes a meter that can register DC milliamps, and should be 350 to 750 millivolts. Heat the thermocouple with the pilot or other flame source and check, if OK, gas valve is weak.
I would remove pilot light assembly and clean orifice and blow out gas line to pilot. Check to see that thermocouple is centered in pilot flame. It is possiblethat your gas valve is bad but it is also possible that you got a defective thermocouple. I would change the thermocouple again as they are much less expensive then the gas valves. The next time when you are sure you have the thernocouple mounted as close to the center of the pilot flame hold the pilot button down for several mins. If none of this works then you may have to change your gas valve.Thank you.
The thermocouple is bad or not aligned properly. It is the metal bar in front of the pilot light. This bar senses the heat
put off by the pilot light. If it does not get hot it will not allow
the gas to flow. You either need to align it so that it is in front of
the pilot light and receives enough heat to allow the gas valve to
operate or possibly the thermocouple has gone bad and needs replacing.
It could also be that you are not waiting long enough. The thermocouple must sense the heat for at least one minute or more before it will let the gas valve turn on. Turn everything to off for at least five minutes. Re-light the pilot light and let it burn for at least one minute and then try turning the knob to on.
If your pilot light will not stay lit when you release pilot light button then chances are that your thermocouple is bad. Make sure that the tip of thermocouple is directly in line with pilot light. Tip of thermocouple should be cherry red if it is properly placed. If pilot will not stay lit then replace it. If you aren't sure about placement of thermocouple you can heat thermocouple with a seperate heat source. If you do this and pilot light stays lit then reposition thermocouple in pilot flame. If it still won't keep pilot burning then replace thermocouple. Hope this helps. Thanks.
Hello, Here's a few things to check. When you light the pilot, is it a strong blue pilot flame, a weak blue flame or a lazy yellow flame? Is it heating the thermocouple enough to make it red hot after a few minutes? If the pilot is small blue or lazy yellow flame, it may be dirty and need cleaned. When the burner lights, the weak pilot flame may diminish causing the
thermocouple to cool off enough to shut down the main burner. Clean the dirty pilot orifice by using a can of compressed air with
attached straw. (The same canned air you use to clean computer keyboards) Blow it into the pilot assembly where the pilot flame burns out from and blow thru the air holes on the side, if applicable. You might also check the thermocouple itself to make sure the tip is not partially burn't off. It should be a smooth, rounded tip. Replace the thermocouple if cleaning the pilot orifice doesn't solve the problem. Douglas