Heater flap zero wont set

[brogenville]

Hope someone can help with this one; having just finished an epic 3500 mile trip around the alps (over which the tamora was utterly superb!) I've been getting regular "heater flap fault" warnings from the dash. First thing I went to try was to set the zero position in the POD. I found it set at 16, which accoring to Graham's manual is the standard factory setting, then adjusted it to 26. Problem is though, that having changed it from 16, the setting now seems to be stuck on 0 (zero). It lets me adjust the setting, but every time I go back into the setting menu, the value has reverted to 0. So, can this still be a problem with the flap itself, or is there an issue with the controller/memory that holds this data?

Cheers again lads.