The company said Monday that a decision was made to de-mate the payload from the upper stage to resolve the issue, establish the root cause and perform other checks.
Sea Launch said the Eutelsat 3B satellite was not powered on at the time and was unaffected.
A new launch date was not immediately announced.
The company’s novel launch system employs a self-propelled oceangoing launch pad and a command ship that travel from California to the equator, where its rockets carry satellites into orbit. The system’s successful maiden launch occurred on March 27, 1999.