Quick post for the benefit of anyone Googling for advice on this topic, as most of the results I found when searching were simply lists of all the fault codes, rather than anything useful pertaining to specific advice.
My Vectra B 2.2 LS (Z22SE engine) was reporting the following fault codes:
P0480 Cooling Fan 1 Control Circuit Malfunction
P0482 Cooling Fan 3 Control Circuit Malfunction
Upon investigation, the problem turned out to be simple – a blown maxi blade fuse in the relay & fuse box in front of the battery – the one shown removed below:
Swapped out that fuse, and job done, no more warning light on the dash.
I like easy fixes :)