Emb-505 flight crew reported a pressurization problem that resulted in a diversion.

Attributes
ACN	1722535
Time
Date	202001
Local Time Of Day	1201-1800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	EMB-505 / Phenom 300
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

In cruise at FL410 dual duct overtemp cas messages displayed. Ran qrc; donned oxygen; and began descent to 10;000 ft. Passenger masks deployed at around 25;000 ft. Airplane altitude and 15;000 ft. Cabin. [Requested priority handling] for immediate descent and diversion. Divert to ZZZ; uneventful landing.

Original NASA ASRS Text

Title: EMB-505 flight crew reported a pressurization problem that resulted in a diversion.

Narrative: In cruise at FL410 dual duct overtemp CAS messages displayed. Ran QRC; donned Oxygen; and began descent to 10;000 ft. Passenger masks deployed at around 25;000 ft. airplane altitude and 15;000 ft. cabin. [Requested priority handling] for immediate descent and diversion. Divert to ZZZ; uneventful 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.