I have a gas furnace in my attic, and I started the pilot light (which is
hitting the thermocouple) but when it is supposed to go on, only a very
slight blue flame emanates from the burner outlets and the fan does not come
on. I can turn the fan on down at the thermostat, but only normal air blows
out of the vents. I don't think it's a fan problem as the fan worked with
the air conditioner.
The small blue flames are easily snuffed out by the slightest breeze.
It sounds like the main gas valve is stuck. This is pretty common with
milivolt valves, although I'm not sure that's what you have. If you give it
a stiff whack, and it opens, that's what it is. I'd have it replaced
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