Carrier comes out but there is no audio

[Jaume]

For the past few days, when I transmit, the carrier comes out but there is no audio. I haven’t changed any settings, and the Icom 7100 is working fine.
Any idea what could be happening? I even changed QTH in case it might be an internet-related issue, but the same thing happens.
Thanks.

[Jaume]

Fixed!!
The codec OUT gain had gone down to 0 when it should be at 255, and there was no TX. The front panel light turned red, but there was no transmission.