2-wire firewolf blinking

Hi. I have a 2-wire firewolf that blinks green on those two LEDs
every few seconds... but then it blinks red a couple of times, then
goes back to green.
I've searched for this in the manual with no luck. I even took it
down and tried to blow anything out of it with a bit of compressed
air, no luck. Is it defective?
Thanks much.
.

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