Hi everyone I am playing that very old above game and I have
Got as far as the coded door, the walkthrough I am using gives
The way to open it by turning the valves I think that's what
They are. but I turn the one that the person has circled and it
Turned out incorrect I can't figure out what I turned wrong.
all help appreciated.

Bluto

If you're talking about this puzzle, there are several valve-like things circled.
http://www.gameboomers.com/wtcheats/pcCc/CrackConsp/Cp01.gif

Or are you talking about a different puzzle?

Hi Jenny100

Yes this is the one I am having trouble I reset the valves
But each time it tell me the settings are incorrect how did
You do this one.

Thank you
Bluto

It's been something like 16 or 17 years since I played it, so I don't remember.

But take note whether the little "plungers" are in or out on the picture.

Also check UHS Hints for the puzzle.
http://www.uhs-hints.com/uhsweb/hints/crackcon/135.php?hint=15

Their picture is a little different
http://www.uhs-hints.com/uhsweb/hints/crackcon/180.php