As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHEN PITOT HEAT WAS SELECTED, CIRCUIT BREAKER TRIPPED. UPON INVESTIGATION, FOUND HEATER ELEMENT GROUNDING OUT TO PITOT HEAD HOUSING. SUBMITTER SUGGESTED CAUSE TO BE PREVIOUS USER TO SELECT HEAT WHILE ON GROUND BEYOND THE 3 MINUTE TIME LIMIT OR NORMAL WEAR.