Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 100; Flight Crew Total 11000; Flight Crew Type 6000
Situational Awareness
Aircraft Equipment Problem Less Severe
Flight Crew Landed As Precaution; Flight Crew Diverted
Aircraft
On climbout; cabin temperature began climbing [and] we were unable to control temperature. All zone temperature indicators eventually read 99 with actual conditions well above. Aircraft side panels were boiling hot. No EICAS messages displayed. Contacted maintenance control for assistance in trouble shooting situation - USELESS. Unable to control temperature and concerned about the extreme heat decided to divert to [an alternate airport].
B767 Captain reported diverting to an alternate airport after the cabin temperature rose to dangerously high levels and could not be controlled.