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If you light your pilot light, hold in the button and then when you release it and the pilot light goes out, generally you need a new thermocouple. Gas repairs can only be undertaken by a qualified gas technician so you can't do this job yourself.
The thermocouple is a safety device that recognises that the pilot has a good flame and is enough to ignite the main burners. The thermocouple open that valve to the burner.
In limited circumstances the thermocouple doesn't need replacing, either the shield that aims the flame to the thermocouple has become dislodged, or the pilot jet is a little blocked by debris. Either way, having the appliance serviced by a qualified gas fitter is the way to go. I am sure you will have seen news stories about explosions caused by gas leaks and faulty appliances.
First locate where to light pilot. You can do this by following thin aluminum colored tubing from control valve to inside heater.In general on top of your gas control valve is a knob. Turn indicator of this knob to pilot and depress knob. This will start gas flow to pilot at end of thin tube. Hold this knob in the depressed position and light pilot. DO NOT release knob for 30 -45 seconds. Then release knob and pilot will remain lit. Then turn knob to on position. If pilot will not stay lit you may need a new thermo coupler, which senses heat from flame to keep pilot gas flow open.
If the pilot stays on when you are holding it down (you are manually opening the gas valve) but won't stay lit when you let the knob go, then the thermocouple is bad. The pilot knob needs to be held down for 30 secs or so. The pilot flame has to heat the tip of the thermocouple long enough to for it to output a small electric signal (that holds the gas valve open). If you look at the pilot flame, you will see the tip of the thermocouple in the flame. That copper tube runs from the flame to the gas valve and is easy enough to replace. They sell them at most hardware stores. If you see a lot of ash buildup on the tip, you can turn the pilot off and clean the tip and try again.
the pilot light serves to purposes. it is the source of ignition for the main burner and is a safety device that detects wether there is a flame or not. if the pilot light stays on when you stop pressing the pilot light button then you need to turn the knob to the on position to light the main burner. the pilot light is not the on position. if the pilot light goes out when you stop pressing the pilot light button then the thermocouple or flame sensor needs replacing. good luck
You need to turn the knob on the gas valve (inside the heater) to the "pilot" position. Then, while holding a flame over the pilot assembly push down on the knob.
Gas should come out of the pilot and ignite. Continue holding the knob down for 10-15 seconds. Release the knob and the pilot should stay lit. If not the pilot generator may need to be replaced.
Turn the knob to the "on" position, close the heater and turn the heater on and turn the thermostat to hot. The heater should fire. If it does not fire and the pilot goes out, that may also indicate a pilot generator problem.
Linda, it is not easy to explain I would go to the Goodman website and see if you can down load a manual for your unit or maybe see a blown up picture of it showing the pilot once you can see the parts and know where they are then we can help a little maybe You have to find the gas valve on it is a knob that should have on off pilot you would turn that to pilot and push down hold for about 30 seconds Before doing that you will see three tubes coming from the valve one big one and two smaller ones follow the bigger of the two small ones At the very end of that is the pilot light (it will not be burning ) After holding the pilot knob down fro 30 sec place a flame/match near that opening at the end of the tube you followed a small flame should start ,this may take several attempts to light If this is an electric type you would do the same thing only you should see a button that says push or igniter so you would hold the pilot button down and then push and release push and release igniter until the pilot lights once it comes on and burns for a few seconds release the pilot knob and turn the knob to on You then should get a flame if the thermostat is set If you have never done this see if you can get a neighbor or someone to show you how
Without a pilot flame sensor signal the pilot light will not stay on and the heater won't work. Try Replacing the pilot flame sensor, the pilot flame burns on to it and it connects to the valve. It looks like a wire.
When you say two burners, I believe you are referring to the pilot flame and the main burner. The pilot flame has to light and heat the thermocouple befoe the main burner will ignite. The pilot flame will not light if: there is not enough gas in the tank, the pilot jet is clogged, or the regulator is bad. Check the tank to make sure it has gas. The next thing to check is the pilot jet. You have to take the heater apart, somewhat, to get to the pilot jet. The tube and the orifice need to be cleaned out, compressed air in a can and a pipe cleaner make the job a little easier. If this does not work, replace the reglator and hose.