I "got a man in".
That's how I know that the thermistors are OK as is the pump. The
thermistors were replaced and the pump was shown to be running at 2400
rpm or so, its rated speed.

The problem is that if it's the control board both the Potterton
handbook and the diagnostics in the "bloke's" laptop says, "Do not
change the Control Board unless the display is showing an error code".


Since there's no error code showing, the "bloke" says it isn't the
control board, which, of course, it might be.

Naffer