A319
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Aircraft Equipment Problem Less Severe
Flight Crew Diverted; Flight Crew Landed As Precaution; General Flight Cancelled / Delayed
Aircraft
Flight departed ZZZ to ZZZ1 and returned to ZZZ after a failure of environmental controls left crew unable to control temperature inside aircraft. During climb thru approximately FL160 air condition system commanded full hot in all zones and cabin and flight deck temperatures rapidly rose. Crew was unable to regain control and as temperature reached very high levels; elected to return to ZZZ without further incident.
A319 Check Airman reported air return after environmental system control failure.