B737-800 flight crew reported returning to the departure airport after they experienced an air cycle machine failure that resulted in high cabin temperatures.

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Attributes
ACN	1419491
Time
Date	201701
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 21000
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

During climb out (low 20;000s) received call from cabin that the temperature in cabin was very hot and getting worse. Was not able to control heat from air-conditioning pack; returned to [departure airport]; landed overweight but uneventfully.was told by mechanics there was an air cycle machine failure.

Original NASA ASRS Text

Title: B737-800 flight crew reported returning to the departure airport after they experienced an air cycle machine failure that resulted in high cabin temperatures.

Narrative: During climb out (low 20;000s) received call from cabin that the temperature in cabin was very hot and getting worse. Was not able to control heat from air-conditioning pack; returned to [departure airport]; landed overweight but uneventfully.Was told by mechanics there was an air cycle machine failure.

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.