I too have seen that problem with a Hos board. And was able to confirm no power to cc, pump running, lls open hg closed and all the correct leds lit. I actualy chased that problem for a while before it showed. Low ice production, The machine would do fine while I was there.
If the board looses power when power is restored it will chirp.
If you find a board doing strange things check the solinoid coils.
Found one that after I reset it, it would not bring on the cond fan after the first harvest. Hos tech steered me to the hg valve coil problem solved.