Pilot won't light

Any parts been changed? valve might be wearing out.

If you are referring to a gas fireplace:

• Make sure the pilot knob is turned from "pilot" to "ON" or it will never run.
• If the pilot knob is "ON", and the pilot is lit, but the burner won't light, it could be a bad Thermopile. The thermopile is the other safety mechanism in the pilot assembly that controls the burner.

light your pilot and take a light to the termopile (right beside your pilot it sticks out to get heat from your pilot. hold lighter for 5 seconds and turn gas on

Dust gets inside the pilot safety during the months when it is not in use. Blow out the pilot safety without disturbing the flap. and retry.
ODS VENT FREE HEATER TUNEUP

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Clean pilot first see if it lights if not you could change thermocouple

try cleaning the pilot light jet, usually gets dust etc inside it. clean it with a pin. but remember do not mess with gas appliances if you are not confident enough. as being cold will be the least of your worries lol

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.!

It won't be the pilot light, It will be the gas valve control, if the pilot light actually lights but the burners won't light,, then you need to check the thermocouple , its that little round thing that sits inside the flame of the pilot light, and has (usually) a copper tube that runs back to the actual gas valve, If its gone bad, the signal to the gas valve is lost so the gas never gets released so nothing lights