ERJ145 flight crew reported a loss of pressurization during climb that resulted in a diversion.

Attributes
ACN	1741304
Time
Date	202004
Local Time Of Day	0601-1200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Vectors
Flight Plan	IFR
Component
Aircraft Component	Pressurization Control System
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

On our way to our assigned altitude of FL360; passing through FL280; the first officer noticed the cabin altitude on the EICAS was in the amber range with a cabin altitude of about 8;500 ft. We leveled off at FL280. Shortly after; the cabin altitude increased rapidly into the red range. The red warning light illuminated along with the master aural warning; 'cabin'. We ran the rapid cabin depressurization checklist; [advised ATC] and descended to 10;000 ft. During our descent we ran the respective QRH checklist. After reaching 10;000 ft. The cabin altitude appeared to stabilize and go back into the green range. We diverted to ZZZ and made a safe landing with no injuries reported.

Original NASA ASRS Text

Title: ERJ145 flight crew reported a loss of pressurization during climb that resulted in a diversion.

Narrative: On our way to our assigned altitude of FL360; passing through FL280; the First Officer noticed the cabin altitude on the EICAS was in the amber range with a cabin altitude of about 8;500 ft. We leveled off at FL280. Shortly after; the cabin altitude increased rapidly into the red range. The red warning light illuminated along with the master aural warning; 'CABIN'. We ran the Rapid Cabin Depressurization checklist; [advised ATC] and descended to 10;000 ft. During our descent we ran the respective QRH checklist. After reaching 10;000 ft. the cabin altitude appeared to stabilize and go back into the green range. We diverted to ZZZ and made a safe landing with no injuries reported.

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.