As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF, THE EMER PRESS LIGHT ILLUMINATED AND THE EMER PRESSURE ACTIVATED TWICE. TEMP CONTROL KNOB WAS AT THE 11.00 POSITION. WE WERE REQUESTING HEAT NOT COLD AIR. REPLACED 410 SWITCH IAW CE560 MM CH 21-51-00, OPS CHECK GOOD.