Narrative:

Upon leveling off at 33,000' it was noted that the cabin was continuing to climb and was above the normal selected altitude in the cabin controller. We attempted to control the cabin manually but discovered the outflow valve was full closed. We requested and received a lower altitude from ZJX. As we started descent to FL240, it was apparent the cabin would continue to climb at about 600-800 FPM. We then requested and received clearance to 10,000'. We went through the procedures for an emergency descent. At FL280, the cabin warning light came on. Shortly after, the passenger O2 masks deployed. Aircraft leveled off at 10,000' and when the cabin descended below 10,000', passenger and crew went off O2, flight diverted to atl without further incident. No emergency was declared. Aircraft had a history of temperature/pressurization problems. O2 masks deployed normally. Passenger remained calm, and there were no injuries or further problems.

Related reports:

Google
 

Original NASA ASRS Text

Title: ACR MLG UNABLE TO CONTROL PRESSURIZATION AT FL330 HAS TO DESCEND TO 10,000 AND THEN DIVERT TO ALTERNATE.

Narrative: UPON LEVELING OFF AT 33,000' IT WAS NOTED THAT THE CABIN WAS CONTINUING TO CLIMB AND WAS ABOVE THE NORMAL SELECTED ALT IN THE CABIN CTLR. WE ATTEMPTED TO CONTROL THE CABIN MANUALLY BUT DISCOVERED THE OUTFLOW VALVE WAS FULL CLOSED. WE REQUESTED AND RECEIVED A LOWER ALT FROM ZJX. AS WE STARTED DSCNT TO FL240, IT WAS APPARENT THE CABIN WOULD CONTINUE TO CLIMB AT ABOUT 600-800 FPM. WE THEN REQUESTED AND RECEIVED CLRNC TO 10,000'. WE WENT THROUGH THE PROCS FOR AN EMER DSCNT. AT FL280, THE CABIN WARNING LIGHT CAME ON. SHORTLY AFTER, THE PAX O2 MASKS DEPLOYED. ACFT LEVELED OFF AT 10,000' AND WHEN THE CABIN DESCENDED BELOW 10,000', PAX AND CREW WENT OFF O2, FLT DIVERTED TO ATL WITHOUT FURTHER INCIDENT. NO EMER WAS DECLARED. ACFT HAD A HISTORY OF TEMPERATURE/PRESSURIZATION PROBLEMS. O2 MASKS DEPLOYED NORMALLY. PAX REMAINED CALM, AND THERE WERE NO INJURIES OR FURTHER PROBLEMS.

Data retrieved from NASA's ASRS site as of August 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.