Super King Air 200
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor
Flight Crew Last 90 Days 150; Flight Crew Total 14000; Flight Crew Type 1600
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Flight Crew Diverted; Flight Crew Landed in Emergency Condition
Aircraft
We departed for a flight with 2 passengers. We had the cabin mode controller in manual cool since it seems to cool down better in this mode. We were cleared to flight level 220 and as we climbing through about 17;000; I tried to warm the cabin some by holding the increase temp switch. It didn't seem to be warming much so I switched to manual warm. When I did we lost all bleed air coming into the cabin and the cabin altitude started climbing. I attempted to re-select manual heat and nothing happened. I tried auto mode and still nothing happened. At this point the cabin altitude was approaching 8;000+. We don oxygen masks and [notified ATC]. We were immediately cleared to 10;000 feet. We ran the checklist and were asked where we would like to divert to. I asked for ZZZ which we were then cleared to. We did not try to re-pressurize the cabin. We made a slow descent into ZZZ.
BE-200 First Officer reported loss of pressurization inflight.