As I understand it with the digital shower there is no isolation valve as such ?? when the shower is turned on , it is done via a low voltage electronic signal to the box of tricks in the loft ( in this case ) which deals with all the on off's Mixing & temp ??
If my mem serves me correctly there are a number of adjustments inside the box of tricks for temp , & I beleive in some ?? for adjusting parameters for pressure ect which may or may not be relevant for combis ?? any nrv's that may or may not ?? be present would be in this box ( I would think ?) there may well be a problem with this unit ? there should be isolation valves on it generally black plastic ball o fix valves .
If my mem serves me correctly there are a number of adjustments inside the box of tricks for temp , & I beleive in some ?? for adjusting parameters for pressure ect which may or may not be relevant for combis ?? any nrv's that may or may not ?? be present would be in this box ( I would think ?) there may well be a problem with this unit ? there should be isolation valves on it generally black plastic ball o fix valves .