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Trying to figure what is wrong with my gas fireplace. I tried to start it few days ago first time since last winter, I brushed the thermocouple, thermopile and the burner, also used compressed air spray. Now the issue is that the pilot (blue/yellowish color) stays on, fire starts properly and after 10-15 seconds it dies completely (I can hear a click and even pilot goes off). Any ideas what is wrong?

Thank you!