EMB ERJ 170/175 ER/LR
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
ATC Issue All Types; Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Fuel Issue
Flight Crew Requested ATC Assistance / Clarification; General Maintenance Action
Aircraft
While climbing out around FL210 we got an EICAS message Presn Auto Fail. We requested to stop the climb at FL220.  I ran the associated QRH Procedure and was unable to reset the Auto Function.  A few minutes later we received the Presn Man Fail message as well. I ran the associated QRH Procedure and requested 10;000 FT from ATC. We descended quickly to 10;000 and the cabin never climbed above 8000 ft. I was able to raise Dispatch and after talking to Dispatch and Maintenance Control I elected to continue to destination at 10;000 FT with Pack 2 on and Pack 1 off.  The Cabin was fairly stable at about 5000 FT for most of our time at 10;000 but we were unable to control it and had the ability to turn off the packs if it went crazy.As we approached our destination; ATC tried to vector us out several times and I repeatedly told them we were tight on fuel.  We did not declare minimum fuel because we were still showing landing over 3000 LBS; but we wanted to know what their plan with us was so that we could continue to monitor our fuel situation.  The Packs were turned off as we descended from 10;000 FT and the approach and landing were uneventful except for the Cabin Temperature Rising.  I believe our companies Maintenance procedures of simply powering down the aircraft powering it back up and ops checking items is unwise. And this may have contributed to this failure.
ERJ170 Captain experiences a pressurization anomaly passing FL210 and stops at FL220 to perform QRH procedures. With Presn Auto Fail; manual is selected but also fails. The flight descends to 10;000 feet for the remainder of the flight to destination airport.