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Re: need to know how light pilot
First step turn the thermostat off. It is very important. Next find the knob on top of the gas valve you will see writing on it turn it to pilot it could be in the off position so move it to pilot depress the knob where it goes down about one inch. Take a long lighter long match or something like that and hold at the pilot it will be back in the furnace by the front of the burners. Once the pilot lights hold the button for another 30 seconds. Release the knob now the pilot should be on and the next step is why you turned off the thermostat rotate the knob to on position. Go to the t-stat and turn on the heat.
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First, the thermostat white wire is the wire that initiates the furnace to start. When you select heat on your thermostat the tech should get a 24-28 volts between the white wire and common on the thermostat wire in the furnace. If you do not get the required voltage, there is a break in the wire from the furnace to the thermostat that needs to be tracked down and eliminated.
Depending on the furnace you might not hace a pilot light. There are several types of ignition devices. One of the more common a pilot light the second being a hot surface ignitor that glows red much like the heating element in a oven. Its possible that the HSI has cracked and needs to be replaced. Look for it on the left or right burner tube in the combustion compartment. It will either look like a rod about 3" long or a flat M.
Without knowing exactly who the manufacturer is and the model number of the furnace, most of us really don't want to reply to this question, for fear of you blowing yourself up. So, if you can provide that information, I'm sure one us can help you.
The goodman furnace will try and light three time before it faults out for safety reasons. Adjust the flame sensor so that it is closer to the flame or actually in the pilot flame. If the flame sensor is inside the pilot flame and still does not stay lit, your flame sensor is probably defective and should be replaced. You can get one at Ferguson's counter sales.
If it is an old furnace with a manual pilot light there are pilot lighting instructions usually on a door or panel. If it is 15 years old or newer it probably has either a spark ignition or a hot surface ignitor. These can't be lit manually. If they fail they usually require parts to be repaired.
First thing and this is very important turn the thermostat off. When you are in front of your furnace remove the top cover to expose the burners and pilot light. You will see a gas valve that has a knob, lever, or some kind of switch on top of it. It will have off pilot and on in raised letters on top of it. Now move the knob to pilot position and if you have a long lighter or maybe fireplace match something long enough to reach back into the unit about 10 inches or so. Depress the knob hold down reach back with lite match, lighter and get close to pilot and there it will lite. Hold knob down for about 30 seconds and let go. Did the pilot stay on? Good if it did. Turn the knob to the on position and go to the thermostat and turn on the furnace. Now if you are nervous about lighting the pilot light you could call the gas company in your area and explain your situation and they should come out and do it for free. let me know how it turns out. ken