Date: 202107
Local time of day: 0601-1200
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Daylight
Aircraft: EMB ERJ 145 ER/LR
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Climb
Airspace: Class A ZZZ
ATC / advisory: Center ZZZ
Aircraft component: Air Conditioning and Pressurization Pack
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Human factors: Troubleshooting
Second reporter function: Captain; Pilot Not Flying
Anomaly: Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Aircraft
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Landed in Emergency Condition; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Departure Airport; General Flight Cancelled / Delayed; General Maintenance Action
Contributing factors: Procedure; Human Factors; Aircraft
Primary problem: Aircraft

Narrative: Company Aircraft X; ZZZ to ZZZ1 departed at XA:00. We took off from Runway XX with right turn radar vector to a heading of 270.  I was the pilot flying and my Captain was the monitoring pilot. We were in a normal climb and around 5;000 feet we got an advisory message; cyan color in the EICAS. The message we received said 'PACK 1 VLV CLSD.' Captain pulled the QRH; which indicated to reset the associated pack by pressing and then depressing the pack 1 button. The Captain did so and the message went away.  We kept climbing and the same message then came back; she ran QRH again but I suggested to press the PACK 1 button; give it a few seconds; and then depress it again. The message went away. Passing 18;000 cleared to climb to FL330; the same message came back. At this time I felt like I was getting unusually hot even though we were flying against the sun. However; I checked the ECS and it showed 29 degrees Celsius in the cockpit and about 19 in the back. Captain did the QRH again and it told us to maintain FL250 and so Captain requested FL250 due to Pack issues. Captain then immediately looked for the cabin altitude in the EICAS and verified it in the QRH. QRH suggested a cabin altitude of 2700 and the EICAS showed a cabin altitude of 2900 and climbing. At that point Captain asked the FO (First Officer) to initiate an emergency descent immediately. Memory items were then performed by the FO while Captain asked ATC for an altitude descent to 10;000 feet. ATC asked to confirm the clearance descent to 10;000 and whether we were requesting priority. The Captain responded affirmative to both. The Captain then coordinated with the Flight Attendant for an emergency descent. We did the emergency descent QRH. Once we were in a stable descent at a rate of approximately 5;500 feet per minute while descending and keeping 245 to 250 kts for landing gear limitation; FO and Captain asked each other if they were ok and the answer was yes. Passing 15;000 feet; FO started reducing the rate of descent to 3;000 feet per minute and kept reducing the rate of descent gradually to 1;000 feet per minute by the time we got to 11;000. At 10;000 feet FO changed the plane to a clean configuration; we then requested radar vectors back to ZZZ and proceeded with normal flight. Aircraft X landed back in ZZZ with no further issues or incident.


Second narrative: During climb around 5;000 feet 'PACK 1 VLV CLSD' showed on the EICAS. CA (Captain) reset the associated pack; message extinguished and showed up again after a few minutes. Message persisted 3 more times. Pack one was reset 3 times following QRH procedures. CA messaged Dispatcher to run numbers for FL250 as it was the max altitude per QRH with one pack inoperative. CA put a request for the new altitude with ATC. Around FL210 CA noticed on the EICAS the cabin altitude was increasing quick and referred to the QRH. Airplane altitude was FL210 and cabin altitude was at FL290. CA told FO (First Officer) to initiate an emergency descent; advised ATC and Dispatch and was cleared to return to ZZZ and land. FA (Flight Attendant) was notified as soon as the pressurization problem was noticed and [procedure] was performed. FA was advised to prepare the cabin for landing. After reaching 10;000 feet FO and CA performed QRC and QRH. FO was flying; CA acquired landing data; and set up the approach. FO landed safely. Aircraft was deplaned and taken for maintenance.


Synopsis: Flight Crew reported a pack valve failure caused the cabin to not pressurize and resulted in descent and precautionary landing.