Narrative:

Airplane had pack 2 MEL'd as well as fdr on MEL. Flight to ZZZ went uneventful. Climbing out from ZZZ around 12;000 ft experienced a BLEED1 ov temperature warning. We went to the QRH and accomplished the steps and before the end of the QRH it had resolved itself and stabilized. We elected to continue to [our destination] as the condition set forth was we still had 2 operative bleed systems. We continued our climb to FL240 and had leveled off in cruise. Not long after; the pm (pilot monitoring) who was a line check pilot administering day one of my captain oe noticed a cyan advisory message indicating pack 1-2 vlv clsd. Pack 2 closed is normal due to its MEL however pack 1 closing wasn't expected and shortly after we both noticed the cabin alt and cabin rate begin to rise indicating a loss of pressurization. We asked ATC for lower and ran the rapid cabin depressurization qrc as a precaution; donning our masks; seatbelt sign already on; and began our descent down to 10;000. We wanted to better gauge the situation before declaring an emergency; however ATC [still gave us priority and cleared] the airspace around us to get down. During the descent we also got a bleed 2 closed message. After leveling off at 10;000 we began to prepare for our diversion to ZZZ1. We ACARS dispatch and let them know and that [a problem had occurred]; and they let [operations] in ZZZ1 know of our arrival. Due to excess fuel and weight; we vectored around for about 30 minutes to get under maximum structural landing weight; which we accomplished. Approach and landing to runway xx and parking into gate went uneventfully. We opted to divert to ZZZ1 due to icing conditions encountered and enroute; suitability; and close proximity to location.I've noticed a trend of single pack dispatched airplanes; which takes away redundancy on longer flights such as [this route]. Would like to see proactive management of pack and bleed system health throughout the fleet.

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Original NASA ASRS Text

Title: ERJ-145 pilot reported a pressurization problem due to air conditioning pack valve issues.

Narrative: Airplane had PACK 2 MEL'd as well as FDR on MEL. Flight to ZZZ went uneventful. Climbing out from ZZZ around 12;000 ft experienced a BLEED1 OV TEMP warning. We went to the QRH and accomplished the steps and before the end of the QRH it had resolved itself and stabilized. We elected to continue to [our destination] as the condition set forth was we still had 2 operative bleed systems. We continued our climb to FL240 and had leveled off in cruise. Not long after; the PM (Pilot Monitoring) who was a Line Check Pilot administering day one of my Captain OE noticed a cyan advisory message indicating PACK 1-2 VLV CLSD. Pack 2 closed is normal due to its MEL however pack 1 closing wasn't expected and shortly after we both noticed the cabin alt and cabin rate begin to rise indicating a loss of pressurization. We asked ATC for lower and ran the Rapid Cabin Depressurization QRC as a precaution; donning our masks; seatbelt sign already on; and began our descent down to 10;000. We wanted to better gauge the situation before declaring an emergency; however ATC [still gave us priority and cleared] the airspace around us to get down. During the descent we also got a BLEED 2 closed message. After leveling off at 10;000 we began to prepare for our diversion to ZZZ1. We ACARS dispatch and let them know and that [a problem had occurred]; and they let [Operations] in ZZZ1 know of our arrival. Due to excess fuel and weight; we vectored around for about 30 minutes to get under maximum structural landing weight; which we accomplished. Approach and landing to runway XX and parking into gate went uneventfully. We opted to divert to ZZZ1 due to icing conditions encountered and enroute; suitability; and close proximity to location.I've noticed a trend of single pack dispatched airplanes; which takes away redundancy on longer flights such as [this route]. Would like to see proactive management of pack and bleed system health throughout the fleet.

Data retrieved from NASA's ASRS site 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.