"Pete D" writes:

"Proch" wrote in message
. ..
A lot of historical posts suggest that the woodpecker knows that there are
insects beneath the wood, yet my inspection of the carnage suggests none.

Look closer, cuz those posts were right. The woodpecker isn't doing it
because he likes you or your house...he's doing it for food.

Inspect the bottom of all of your fascia boards for perfectly round holes,
the sign of carpenter bees...that's where my money's at. When you find the
holes, spray any good insecticide in there...your bees and your peckers'll
be gone in no time.

Yep. Carpenter bees are the most likely cause.
Insecticide might work. Here we solved it by covering the trim with aluminum.