Control 24 self test, no fader values touch mode

[Analogue_Rocks]

Hi I have an "H" series control 24, everything self test fine ,

even in Fader / Group test, it accurately follows the value of each of the 24 faders, on every single fader, with each of the 24 as master 100% ok

But in Fader / "Touch" test, no values change, every thing sits around a 3 digi value eg 153, 157, 173, no preceding 0 and when i touch that fader I then get
e.g T153 or t157 etc, it recognises that I touch each fader as I get the "t" prefix on each of the 24.

Was running self test in stand alone no ether net or mac connected

any ideas? anyone?

Please advise