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Take a look at this board and see if it looks like your board
Got any idea how old unit is or do you have a picture of unit? That one was an upgrade for the old Hp7,8,9 and 10
Yes, picture might help me identify
Take a look at this upgrade kit and tell me if you have those RST and HOLD terminals
This shows to be the replacement for the CHP10 packaged unit
It does to me. I can not see all the letters by your terminals, The AC plus and AC minus are labeled 24v and Com on new board.
Is it possible that that wire you think goes to reversing valve may go to a high pressure switch on refrigerant line?
Doesn't look like anything I have goes back that far on wiring diagrams.Will se what I can come up with
WE can continue here tomorrow,If I find anything, I will respond here.We can leave the question open until we are done.