As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHEN INSTALLING AN ELT IN THE AIRCRAFT THE NORMAL TEST FUNCTIONED OK HOWEVER WHEN THE ELT WAS ARMED IT SHOWED AN ERROR CODE OF 3 FLASHES. THE ELT WAS REMOVED AND INSTALLED IN ANOTHER AIRCRAFT WITH THE SAME RESULT. A DIFFERENT ELT WAS INSTALLED AND TESTED IN THE SUBJECT AIRCRAFT WITH NO FAULTS. THE ME406 ELT HAD JUST BEEN REPAIRED DURING ITS ANNUAL RECERTIFICATION.