My I2 had been working fine since installed 3+ years ago, but recently stopped working (no lights). There was some blackening of the inside of the box. I spoke to Paul McAllister at Intelligent Immersion. Instead of being fobbed off with the usual "outside guarantee period" response, he was honest enough to suggest it was a manufacturing fault that had affected a number of machines produced some time ago.

10 days later (including two weekends) my I2 is back on the wall functioning perfectly, having had the faulty component replaced, been fully tested, and at no cost to myself. Outstanding.

Thank you Paul!