Hi Snowtrooper - How are you getting on with this? Any progress?

I have a Volcano and happy to try and help.

Mine behaves like this:
- When the machine is turned on, the Fire Pit solenoid fires (thunk) just that one.
- When a game is started, if the machine doesn't get 3 balls into the holding chute, then it'll sit there in the state you describe indefinitely.

So:
- Make sure there are three balls in the thing!
- Make sure they all sit in the holding chute, or in out hole when a game starts
- When a game starts, you should see them all make their way to the holding chute, *then* a ball is release to the lane

First thing I'd check is the switch in the holding chute at the 3rd ball position. It will message that all balls are present and it's time to release a ball into play.