If you notice closely, the sprinkler head is turning at the beginning of the video, but watch how the head begins to jerk or ratchet towards the end, this is an indication that it is failing. Often times when we check heads daily, the head turns fine and then we shut it off, but next time it comes on it begins to jerk and ratchet and then fails and we may not notice it for a day or two since we just checked it.
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