Pilot won't stay lit on furnace

Thermostat problem not coming on on temp fall bridge out stat and see if it lights

Rita, Check the attached links,instruction and guides to trouble shoot pilot light, Good luck
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Gas Heater Pilot Light Troubleshooting
What to Do if Gas Furnace Pilot Light Won Stay Lit DoItYourself com
Furnace Won Ignite Why and What to Do

What is the make and model# of your Furnace? And is it a pilot light, or a hot surface Igniter?

Either the pilot asembly needs to cleaned or the gas valve is faulty.

Here is something similar that happened to me. I went through the same steps you went through and upon closer inspection, I found a spider had made a web inside the supply line only letting a small trickle of gas through. Have you verified there is nothing blocking the line?

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.

You need a themocouple, it's a cheap $10.00 part you can get at any hardware store, you have a standing pilot light furnace like mine, if your handy and safe you can put one in easy, youtube is loaded with videos on how to do it. These other answers are wrong for your unit.

The pilot flame must touch (burn) the tip oqef the t-couple to hold the magnet in the gas value open.make sure the pilot orifice (hole) is clear.the pilot pressure (in the tube) is factory set full open & can only be adjusted down (less). Also check the gas **** didn't get closed or turned half way.? Assuming its not the t-couple. If all is good & it still won't stay on. Replace the gas value.!

Hi, with a new thermocouple, the only other thing it can be is the valve. Replace the valve.