I'm in a really old house with a really old furnace.
Recently discovered that the pilot light was out and after re-lighting it, it seems to be working with the furnace running.
Problem is, when the furnace stops running (reaches the temperature set on the thermostat), both the burner and pilot light extinguish.
I'm going to change the thermocouple out, as that seems to be the cheapest fix to troubleshoot, but would like any other feedback. To add, when I light the pilot and hold it on (waiting for the thermocouple to heat), it does seem to take quite a long time 30 seconds+ before the pilot will keep on by itself.
I have nothing to compare this to, whether this is normal or not.