A former school district worker who quit after being passed over for a promotion was charged with hacking into his old employer’s computer system.

Randall Chua Antonio, 32, was charged Jan. 24 with seven felonies in connection with 30 computer break-ins over 11 months at the San Diego Unified School District.

Antonio pleaded innocent to the charges, which include disrupting computer services, destroying data, and accessing a computer system without permission.

He is accused of hacking into the district’s computers so that employees couldn’t access the system or to destroy data, but authorities don’t believe any student information was compromised, said Gayle Falkenthal, a spokeswoman for the San Diego County District Attorney’s office.

The district lost work hours and the cost of repairing the system, but the amount of the damage was not available, Falkenthal said.

Antonio worked nine years at the district’s maintenance operation center, where he designed and administered its computer system and web site. He quit in August 1998 and the alleged break-ins began a month later and continued for a year, court records show.

“It is my understanding that he was unhappy about being denied a promotion prior to leaving the school district,” Falkenthal said.

School district spokesman David Smollar declined to comment.

Antonio faces a maximum sentence of five years in prison and restitution of $5,000 if convicted