According to the manual the initial set up of "TV1" on the Tihao uses the Philips 027 code set; which, given what I've now learnt of Aristona, is fairly logical - and the likely reason for it's working (albeit in a limited fashion) straight out of the box.

What you need to do is to follow the Factory Brand set up set instructions and try the other Philips code sets. Hopefully one of them will work.