Good evening Dave,
The problem is I replaced the heat pump about four weeks ago, due to a no heat fault.
However, the fault has recurred, and I suspect the power module/board.
I feel the heat pump, board, and associated wiring is very difficult to test conclusively, due to some of the tiny connections etc, and would like a wiring diagram to try and see what all these connections relate to.
The replacement heat pump is a genuine Copreci part, and wiring continuity from board to heat pump all fine.