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These are designed not to light once the thermocouple fails.the thermocouple has a small wire that positions in to the pilot light which checks the pilot is on and keeps the gas governed.once the temperature drops it shuts off the gas to prevent a build up of gas in a room where a pilot light has gone out.this is why you need to hold the button in on reignition to allow the thermocouple to heat up so the gas keeps open.
Try to relight by turning on the gas ....pressing down and holding the button for at least 10 seconds whilst firing the piezo to ignite flame.do not release gas button for at least 10 seconds then slowly release.if the flame on the pilot will not stay alight....then it is likely the thermo has failed.try cleaning the metal wire that is above the pilot jet.still no joy then it needs replacing.hope my comment is of help...please vote.
Hello
Sounds like the thermocouple is going bad.The thermocouple is a thin tube that runs from the pilot lite to the gas valve.
What it does is it sences the heat from the pilot lite and keeps the gas valve open to allow the pilot to stay on.
This can be easily repaird by shutting off power and gas to your heater and removeing the thermocouple from the gas valve,then unclip or unscrew it from the pilot lite area.
Any plumbing supply store or home depot or lowes should have these.
Once you get a new one,install to gas valve and pilot lite area then turn on power and gas to heater and follow pilot lighting procedure,you may need to hold gas on for 60 seconds.
Here is a picture of the thermocouple so you know what to look for.
Open up the union in the gas line and bleed all the air out. Once done the pilot should light in a short amount of time. If it still will not light, remove the pilot and inspect it for spider nests in the head or regulating cap.
You could have a plugged pilot line. You will need to get to the gas valve and shut the gas supply off. Once you did that, unscrew the pilot line that supplies gas to the pilot assembly. You can then turn on the gas supply and rotate the pilot knob to the pilot setting. Depress the knob into the gas valve. You should be able to smell and hear the gas come out of the hole where you unscrewed the pilot line. Don't do this with a cigarette in your face. Once you verify you have gas, release the knob and shut off the gas supply. Take a can of air and blow thru the pilot tube, first from the pilot assembly in the heater then from the open end of the pipe. Replace the pilot tube making sure you don't cross thread the fitting. Tighten well. Again turn on the gas supply, spray or rub some soapy water on the fitting you tightened, depress the knob and hold it. The soap will bubble up if there is a leak. Fix it. Now light the pilot.
The power should turn on a electricigniter once the gas has reached the heat chamber and regulator. If not let me know soon the model number of your LG dryer so I can help you better, Sea Breeze
If this is a milivolt unit, meaning no solid-state or computer/digital controlled. You would need to turn your gas valve to the pilot position, then press in and hold until you can light the pilot using a lighter (this may take several minutes, to bleed the air from gas supply) once there is a pilot flame present, you will need to hold the valve button in for about 45 seconds to heat the thermalpile. Once pilot is lit, thene turn to on position and proceeed to turning thermostate to set temp.
One of the proper ways to light a gas water heater, is to turn the black knob to Pilot, put a match to the end of the pilot light, while holding the match there, push the red reset button down and hold the match & the reset button down for one full minute. Then, release the reset button and turn the black knob to On. This should keep the pilot light on.
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.
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