Gosh, sorry to see a post here that did not get any answers. I guess the posters here, including me, had not checked this thread after hatching our chicks. I really don't know about the effects of altitude on the Brinsea..and I am just 300 ft. above sea level here. I do think the helpful folk at Brinsea could answer your question though. I got prompt replies from a very helpful gal named "Rose" when I had occasion to contact them. http://www.brinsea.com/customerservice/help.html Did you try again and did you have better luck? I hope so.
Best Wishes
Best Wishes