I have an IC-7300 and have tried it with a couple of antennas. In each case the internal tuner works sometimes, and not others. That is not a surprise in itself, but sometimes when the untuned SWR is 1.5:1 the internal tuner still fails. I can operate at 1.5:1, but why is it failing? E.g. in the 20m band, with an EFHW antenna which is resonant in the band.
Specifically, if I hold down "tuner" the tune light goes on and after a short couple of clicks goes off. If I try several times I get the same result. On the other hand, on some other bands with worse SWR, it tunes fine. That is, I hold down "tuner" and it clicks a few times and eventually stops and the tune light stays on.
The radio is new and I am still learning to use it, but I think I'm doing this right. Any explanation, coaching or recommended troubleshooting?