What does it mean when the red LED flashes continuously and rapidly?
A continuously rapid flashing red LED indicates an error. You should remove the batteries, wait 30 seconds, and then replace them. If the red light continues, contact the PetSafe Customer Care Centre — the latch will attempt to unlock so the cat flap can be used in Manual Mode. (Page 7)
From the official Petsafe Ppa44 16427 Microchip Cat Flap manual, page 7
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