As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN TEMPERTURE UNCONTROLLABLE IN AUTO MODE. FOUND CABIN TEMPERTURE CONTROLLER NOT PROVIDING ANY OUTPUT VOLTAGE. CONTROLLLER GIVES MOMENTARY PULSES ONLY VISIBLE USING A TEST LAMP WHICH CAUSES TEMP CONTROL VALVE TO "CLICK" BUT NOT ENOUGH TO MOVE VALVE. R & R CABIN TEMP CONTROLLER. OPS CHECKED GOOD.