As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED & ACFT WAS GNDED. ON CLIMB GOT ECAM VENT AVEC SYS FAULT. THE BLOWER VENT INLET VLV REMAINED OPEN IN FLIGHT & ACFT WAS UNABLE TO PRESSURIZE. ACFT RETURNED TO WHERE THE ACFT LANDED SAFELY WITH NO OTHER INCIDENTS. NO EMER WAS DECLARED. REPLACED AVIONICS VENT SKIN AIR INLET VLV 15HQ & ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK IAW AMM 21-26-52.