B737-800
Flight Crew Air Transport Pilot (ATP)
Flight Crew Total 22000
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Diverted; Flight Crew Returned To Departure Airport; Flight Crew Landed in Emergency Condition
Aircraft
On departure passing approximately 11;000 feet; we had cabin pressure failure and got a CABIN ALTITUDE WARNING light and horn. I was flying; disconnected the autopilot and immediately reversed climb to get down to 10;000 feet cabin. We [advised ATC] and got vectors back to ZZZ for an uneventful landing on Runway XXC.According to maintenance in ZZZ; problem may have been caused by rapid change of temperature gradient overnight on the ground. I have never heard of this issue. They ran 4 tests on both pressure units and we pressurized the cabin at the gate to approximately 3.0 differential. Log book signed off and an uneventful takeoff and flight to ZZZ1.
On climbout from ZZZ passing through 11;000 feet; we had a cabin pressure failure and got a CABIN ALTITUDE warning light and horn. Captain was flying and I was the pilot monitoring. Captain disconnected the autopilot and immediately reversed climb and descended back to 10;000 feet. We [advised ATC] and got vectors back to ZZZ for an uneventful landing on Runway XXC.According to Maintenance in ZZZ; the problem may have been caused by a rapid change of temperature gradient overnight on the ground. Maintenance performed 4 tests on both pressure units and we also pressurized the cabin at the gate to approximately 3.0 differential. Log book was signed off and an uneventful flight to ZZZ1 was performed.
B737-800 flight crew reported a pressurization problem during climb that resulted in a diversion.