Hi, I've been experiencing a few problems getting NIRT's to work with Mitsubishi Electric Cassette units. When intially learning the codes from the Mitsi remote 067CP the IR reader software kept on coming up with an error "Errors:1 unique interval", I was told to ignore this and carry on, which I did. The NIRT's and IR teardrops were duly installed and did not work. I have made up a test lead with an LED to check that there is an output to the IR teardrop and this appears to be OK, as 3 of these units are installed in the feild I do not think that 3 x IR tear drops would be defunct. Any information regarding this problem would be helpful as I currently do not know whether it is a problem with the carrier frequency or pulse/pauses or the command strings learnt from the remote controller.