Hi All

So after bombarding this firm with e-mails and phone calls finally I got a reply and they said to send it back to be checked. Apparently it should be always open, only closing when the tool hits it, so guessing there's a fault somewhere.

I tested it by running the THS program without it connected and it started to descend, but if the THS is plugged in it instantly stops, but also put a circuit tester on the jack plug to the THS and found the circuit was closed, and its suppose to be open.

I'll send it back and see what they say.

Many thanks

:) Don