ISA temp deviation

[SUB320]

Anybody knows what are the conditions required for the ISA temp deviation to be displayed on the lower ECAM? Cannot figure it out- it seems to vary.
Thanks:ok:

[murgatroid]

When STD baro ref is selected, ISA Dev is displayed.

[QAR ASR]

Its very presence has meant that I've not considered the calculation since.

Next, time I go to work i'll check it out and report back, will give me something to do!! How the hours fly by

[Scallywag]

only changes when selected from capt's side, don't know why ?