43 is a reel 3 tilt. 3300 is a hopper empty error. Both of these errors and their resolutions are listed on this page:
http://www.newlifegames.net/igterrors/The "6" alternating with the 43 is indicating that 6 coins were paid out, as you mentioned in your first post.
I'd agitate the coins by hand and then see if any more get paid out. Right now your machine is stuck until it finishes the payout. As cowboygames suggested, check the hopper agitator and the shelf wheel to see if they're worn out.
The 43 error could be caused by something rubbing on the third reel as it tries to spin, or if you bumped it when you had the door open. Close the door all the way. The displays should go blank for a second, and then the machine should try paying out the remaining coins again. If the displays do not go blank for a second after you fully close and latch the door, the machine is not detecting that the door is closed. Check the bill validator stacker (cash can) door to ensure it is closed and latched, and make sure the main door closes and the latch is all the way down. If it still isn't working, your door optics may have gone bad. Check for broken wires near the optics.