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I was messing around with pistons today, and I cam across this weird senario whhere they are not working as expected. I took some screenshots, they are Here and are in order.

I have three pistons on top of each other (A, B and C) with A on top. I have a redstone repeater aiming at a wood block that is next to A


Where X is wood, . is wire and R is a redstone repeater.

  • Starting from off, if I turn power on at A, only A goes out.
  • If I then turn on power to C, B and C go out.
  • If I remove power to C, only C retracts.
  • Once I remove power to A, A and B retract.

If I toggle power the other way:

  • If I turn power on to C, then C goes out.
  • If I turn power on to A, only A goes out, not B.
  • If I remove power to C, then C goes in and B goes out. This is madness.
  • If I remove power to A then A and B retract.

This is really odd behavior. Can someone explain the logic behind it so I can work around it?

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up vote 3 down vote accepted

This is a known glitch feature behaviour. It may or may not be by design. thisismyfirstpost can only come up with this exchange as evidence:

jakpo8: @jeb_ Can a piston push another piston? #
jeb_: @jakpo8 Only when the other piston is contracted #

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In case I wasn't clear, all the pistons are facing to the left. No piston is pushing another piston. – Theo Belaire Jul 5 '11 at 2:45
Oh, I see that has been adressed. – Theo Belaire Jul 5 '11 at 2:50
That link is genius. I now know why my elevator won't work! – Williham Totland Jul 5 '11 at 7:42

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