a command block is receving power with a comparator clock but dont execute the command. I use it for command like testfor and testforblock. Work some times but not everytime
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how does your comperator clock look like, mine works perfectly fine

The input,a comparator and the wire to make the clock work. I dont know why but the signal only respond if the power is at 13 or lower. At 14 or 15, is not working.

Duplicate of MC-11189.

Oh excuse me I do not find this was already posted
Find out that the command block work if the redstone signal is at 13. 14 is not working. 15 too