Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Total 3600; Flight Crew Type 1250
Situational Awareness
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Landed As Precaution
Human Factors; Aircraft
The airframe we were operating had the number 2 pack MELed. In cruise flight the FA (Flight Attendant) called up and said it was warm in the back. So I adjusted the temperature on the number 1 pack to cool it down in the back. After a few minutes of no temperature change I set the number 1 pack into manual mode. After doing that the number 1 pack shut off. We were at 25000 ft. The cabin altitude climbed from 3500 to 7000 in a matter of seconds. I quickly selected the pack off and on to reset it but it stayed off. We began a descent with ATC and decided to divert. After descending for a while the pack came back on. We decided to make a precautionary landing anyways.
EMB-145 Captain reported a cabin pressurization issue after the sole operational pack failed to cool the cabin and malfunctioned.