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[Tirion]

I've encountered this problem in several frotresses in 34.11. I construct a goblin grinder, or another setup with pressure plates linked to floor hatches. Settings are: triggered by creatures, citizens not trigger, 1000 minimum weight, 'any' max weight. It all works just fine. Even when ambushing goblins cross them, I see they are triggered, then reset when they move on.

Then after a few years, they suddenly open the hatch and stay that way. No enemy is standing on the pressure plate, nor any item or even citizen. The only way I can think of to repair this is deconstructing the hatch cover, and building and linking it again.

Anyone has any ideas why this keeps happening? Any easier solution?

[knutor]

Is it the outside hatch or the inside hatch, that is hanging open?  Why I ask, is if its the inside one, its most likely a snatcher or thief in ambush.  Ya need a higher observer(focus trait) dwarf, stationed/traveling in that area, or a low observer dwarf with a good sniffer pet following him.  Or unpen a couple cats.  Prolly the cats are safest, ya don't wanna lose a dwarf or a dog, to a grinder trap misfire.

Some ambushers can hack Hatches like Doors, I believe.  Ya gotta rebuild them, if that happens.  But DF should show it as being hacked by an enemy.  There is a chance, too, that it did break.  Especially if it was a wood hatch, burn maybe? *shrug*  Good luck, Knutor

[Tirion]

Is it the outside hatch or the inside hatch, that is hanging open?  Why I ask, is if its the inside one, its most likely a snatcher or thief in ambush.  Ya need a higher observer(focus trait) dwarf, stationed/traveling in that area, or a low observer dwarf with a good sniffer pet following him.  Or unpen a couple cats.  Prolly the cats are safest, ya don't wanna lose a dwarf or a dog, to a grinder trap misfire.

Some ambushers can hack Hatches like Doors, I believe.  Ya gotta rebuild them, if that happens.  But DF should show it as being hacked by an enemy.  There is a chance, too, that it did break.  Especially if it was a wood hatch, burn maybe? *shrug*  Good luck, Knutor

Inside. Dwarves move around it on a parallel route, anything standing on the pressure plate would have been detected. The hatch is still there (I looked with 't' ), just open for some reason.

[knutor]

Do cats move about, in sight of the open hatch?

Has that pressure plate ever reset?  Civilian triggered pressure plates in my games get a different color when triggered, not sure if Enemy triggered ones do.

I've had this happen, too.  Just hoping your solution isn't the same as mine.  I had to rebuild it to fix it.