As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THE PROPELLER HEAT CB OPENED AND A PROP HEAT FAIL MESSAGE ILLUMINATED ON THE MFD. ATTEMPTED ONE RESET OF CB WITHOUT SUCCESS. REMOVED SPINNER FOR VISUAL INSPECTION AND FOUND 4 OUT OF 5 PROPELLER HEAT HARNESSES HAD CHAFED THROUGH THE INSULATION CAUSING CONTACT WITH PROP SPINNER. REPLACED THE PROPELLER HEAT HARNESSES WITH NEW UNITS P/N 105555 IAW HARTZELL SB HC-SB-30-375. NOTE: THE REMOVED HARNESSES WERE THE SAME PART NUMBER BUT THE INSTALLATION HAD ALLOWED THE MOVEMENT OF THE HARNESS THAT CONTRIBUTED TO THIS ISSUE.