As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHEN IN CRUISE THE TEMPERATURE IN THE A/C STARTED TO GET VERY WARM THE ECS SWITCH WAS TURNED TO MANUAL AND TURNED DOWN. IT GOT VERY HOT SO ECS SWITCH WAS TURNED OFF AND BACK ON. THE HEAT THAN WENT TO THE COLD POSITION AND COULD NOT BE ADJUSTED. TRIP CONTINUED HOME WITH JUST THE ELECTRIC HEATERS. THE CONTROL VALVE WAS CHANGED AND EVERYTHING WORKED FINE.