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I'm going to assume your fireplace has a pilot light.
Follow the little holes in the burner that lead to the pilot light.
Make sure the pilot flame is pointing directly at the closest burner hole. (adjust if necessary).
Often, you will need to sprinkle a layer of "glowing embers" in this area. The embers will help the gas travel to the pilot light and ignite.
Always start your propane appliance on "High" never "Low". Cold propane likes to drop to the bottom of the firebox and accumulate until it reaches the pilot (this is called delayed ignition). Keeping it on "high" will help the fuel travel over to the pilot without buildup.
Thermocouple keeps the pilot lit. Thermopile keeps the burner lit. Please specify what won't stay lit... If it's the burner, you may need to change the thermopile as well. If the pilot still won't stay lit, you will want to make sure that the pilot flame is large enough to completely engulf the thermocouple and keep it hot. If it's too small, you may need to take some compressed air and blow out the pilot hood to remove any blockage.
I don't know if there is a pilot light, spark ignitor or thermal ignitor. I would determine by inspection what kind it has. If you open the front cover you will find a gas valve. It can be identified by following the gas pipe that enters the side of the heater and attaches to the gas valve. If the valve has a control knob on it that has an off, on and pilot position then it is a pilot type. If this control is not on the valve then the unit includes an automatic ignitor.
To light a pilot equipped system place the knob in the pilot position, push it down, and use a flame to light the pilot. If you hear gas flowing from the pilot but it won't light then there is air in the line and it needs to be purged. Holding the pilot lighting valve down long enough will purge it but may take a long time. Periodically you can check it by trying to light it. If it lights watch it for a while before trying to turn the heater on to make sure it is fully purged. Once the pilot is stable and the thermocouple is heated the pilot valve can be released and it should stay lit. If not, try again.
Don't get down and look into the burners while you are trying to start the system because it could flame out and burn your face. If you turn on the heater again then the gas valve should come on and the burner should light. You can usually hear a loud snap when the gas valve come on. You should then hear the gas flow to the burner. If the burner doesn't light you should be able to smell the gas. If it lights exhaust will be coming out of the vents in the top of the heater.
I am sure you will have more questions so please respond with them. I hope this helps.
If your pilot light is lit, then you do have some gas flow, so it is probably the thermocoupler (the part heated by the pilot light) that is not telling the gas valve to open the main line. Sometimes it is just a case of residue on the thermocoupler that is not letting it get up to temperature and sometimes it has been knocked out of alignment and the pilot light is not putting direct heat on it.
A cleaning with steel wool (don't overdo it) would take care of the residue, and you can GENTLY move the thermocoupler back over the pilot flame. If neither of that helps then replace the thermocoupler.
This could be the case if you haven't used the heater for a while. You will need to close the main valve then unscrew the connection to the heater and open the valve for a few seconds till you smell gas. Close the valve and tighten the gas connection again. Leave it to air out for fifteen munites or so and try lighting again. Be sure to let the area air out as gas will explode.
sounds like an obstruction in pilot assembly.try using canned compressed air to blow directly into pilot. this technique is successful about 70%. if not,pilot assembly must be removed and cleaned thorougly
It sounds like a thermocouple has gone bad. this is a very common problem with gas powered things ie; water heaters, furnaces, hot tubs. The telltale sign is when you release the pilot light button it won't stay lit. This is a safety feature and is relatively inexpensive and easy to repair.