Late on Wednesday night, United Launch Alliance's large Delta IV Heavy rocket again came within seconds of lifting off from its Florida launch pad. But once again, the launch was scrubbed.
Following the automated abort of the rocket at T-7 seconds, both the booster and its valuable National Reconnaissance Office payload were said to be safe. Because the abort was triggered just before the rocket's main RS-68 engines had begun to ignite, the delay before the next launch attempt may be less than a week.
"The terminal countdown sequencer rack identified an unexpected condition prior to the engine start sequence," Read More – Source