EMB ERJ 170/175 ER/LR
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Troubleshooting
Aircraft Equipment Problem Less Severe
Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport
Aircraft; MEL
My FO (First Officer) and I were flying Aircraft X which had Bleed number 2 deferred and on climb out we had Bleed 1 fail. This happened at about FL230. As I saw the message and called out the problem I realized that we were no longer being pressurized. Knowing that I suggested we both don our masks stop our climb and ask ATC for a lower altitude. We donned our masks and divided the duties of myself running the QRH and the FO having the radios and airplane. He asked ATC for a lower altitude and [notified them of the situation] while I ran the QRH for the Bleed one fail. ATC gave us a heading and soon after cleared us for an immediate descent to 10;000 feet. I ran the QRH for Bleed 1 fail and the reset worked. We were already on our way down to 10;000. I knew with the APU we could get pressurization at 15;000 if the bleed failed again but with the terrain in between us and [our destination] we decided that the best course of action was to return to ZZZ. We requested that from ATC and started to go there. We wore our masks down to 10;000 feet as the most conservative option should the bleed fail again. I notified the flight attendants and passengers of our situation and that we would be returning to ZZZ. I also messaged Dispatch through ACARS. I resumed control of the radios and my FO flew us to ZZZ without further incident. The highest I saw the cabin altitude get was 8500 and the passenger oxygen masks did not come down.I would say that maybe with one bleed inoperative that we could limit ourselves to a lower altitude than FL310. I feel that if we had been at 31;000 the cabin altitude might have gotten to a point of the passenger oxygen masks coming down depending on how quickly a descent can be made of course. I have heard of this not being the only time both bleeds have failed here so I would also say putting a more restrictive timeline on how quickly the bleed is fixed could also work.
ERJ-175 Captain reported aircraft #1 bleed failed on climb while #2 bleed was deferred resulted in a descent and return to the departure airport.