Enderman auto-spawner stopped

[Ryan Mesure]

Moved my auto spawner/grinder to a new area. It will spawn blaze, cow etc, but not enderman anymore. Any ideas, height? (its 6 tall)

 

[hiroshi42]

The spawner might be searching for a 3 tall area around it, try moving it down one or two blocks and see if that works

 

[Adonis0]

With the set-up you have, I believe there's not enough room, spawners want to place their monsters feet at either, one above, equal to, or one block below.

So with two high monsters, that works when it places it with their feet one block below, because their head isn't in your roof, but for endermen, if it placed them with their feet one below, their head would be in the roof, so it's classed as an invalid spawning location.

 

[Adonis0]

Just realised I didn't put a solution to the problem, just raise the roof by one (At least some of the places), or lower the spawner by one