CRJ900 flight crew reported experiencing pressurization issues.

Attributes
ACN	1359047
Time
Date	201605
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 900 (CRJ900)
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

Passing through FL220; we received a left duct warning message. I leveled off the aircraft and called for the checklist. Within 15 seconds of the warning both packs had shut down. While the other pilot was doing the checklist I advised ATC that we needed to descend to 10000 ft. After completing the checklist; the non-flying pilot notified the flight attendants of the situation and then notified company. After getting everything accomplished we decided to divert to [a suitable airport]. We then notified the company of our plan; then ATC in addition to the passengers. We had a non-eventful landing.

Original NASA ASRS Text

Title: CRJ900 flight crew reported experiencing pressurization issues.

Narrative: Passing through FL220; we received a L duct warning message. I leveled off the aircraft and called for the checklist. Within 15 seconds of the warning both packs had shut down. While the other pilot was doing the checklist I advised ATC that we needed to descend to 10000 ft. After completing the checklist; the non-flying pilot notified the flight attendants of the situation and then notified company. After getting everything accomplished we decided to divert to [a suitable airport]. We then notified the company of our plan; then ATC in addition to the passengers. We had a non-eventful landing.

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.