As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YEG - THE FLIGHT RETURNED TO GATE AFTER THE CREW WAS UNABLE TO CONTROL THE TEMPERATURE IN EITHER MANUAL OR AUTO. MAINTENANCE INSPECTED THE AIRCRAFT AND THEN CYCLED THE SHIP POWER. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.