See Page H-4 or you user guide.Warning Indicator:Incompatible camera warning (non-CLS-compatible)Cause:The mode selector is set to or , or the power switch/wireless mode switch for multiple flash units is set to or when used with a non-CLS-compatible camera.Solution:Set the power switch/wireless mode switch for multiple fl ash units to and the mode selector to .Reference page:F-1I would also add a loss of power, low power, Speedlight movement (not locked or loose) that causes the communication between the camera and Speedlight to be lost and not properly reestablished.
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