B7 RS4 Air Con querie

Hey guys, noticed a few days back that the LED on the "ECON" button doesn't go out.......you press the switch and hold it there...light goes out, let it go and the light comes back on??? It was all working fine until a few days ago, also when you switched the front window demister on the light on the "ECON" button used to go out, now the fan comes on and the light in the "ECON" button stays on...hence no air con. Could this just be a switch/panel fault??? Any ideas....cheers.

Problem solved.... "O" rings leaking where the A/C pipes go through the bulkhead..