"The team received a gaseous helium reg pressure alarm that kicked them out", said Mic Woltman with NASA's Launch Services Program.
NASA is poised to launch a $1.5 billion spacecraft on a brutally hot journey toward the Sun, offering scientists the closest-ever view of our odd and mysterious star.
The mission will carry out its observation through the Corona and how its affect the near-Earth space and change our understanding of the biggest star completely.
At Parker Solar Probe's closest approach to the Sun, temperatures on the heat shield will reach almost 1,371 degrees Celsius, but the spacecraft and its instruments will be kept at a relatively comfortable temperature of about 29.4 degrees Celsius.
This July 6, 2018 photo made available by NASA shows the Parker Solar Probe in a clean room at Astrotech Space Operations in Titusville, Fla.
The spacecraft will thoroughly study the corona - the region of the Sun only seen from Earth during total solar eclipses.
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Thousands of spectators gathered in the middle of the night to witness the launch, including the University of Chicago astrophysicist after whom the spacecraft is named.
The Parker probe's final three orbits - in 2024 and 2025 - will be the closest.
The National Aeronautics and Space Administration (Nasa) had a mission to the Sun which was about to kick off today but now it will take it to the air on August 12. Each flyby will provide an orbit-shaping gravity boost, drawing it ever closer to the sun and straight into the corona - the sun's outermost atmosphere. Even so, Parker's four-inch-thick, 160-pound carbon composite heat shield will be subjected to some 2,500 degrees Fahrenheit during the closest approaches, hotter than flowing lava.
Scorching, yes? But if all works as planned, the inside of the spacecraft should stay at just 85 deg F.
"As we go from the surface of the Sun, which is 10,000 degrees Fahrenheit, and move up into the corona, we find ourselves quickly at millions of degrees", he said. To snuggle up to the sun, it will fly past Venus seven times over seven years.