2004 Audi A6 air con fault?

[Autogasm]

Hi all,

A friend with a 2004 A6 has an air con fault in that it is stuck in 'econ' mode. Pressing any other button makes no difference. As a precaution, he has had the air con serviced so is known to be full of gas. Everything lights up as you would expect, you can alter fan speed and temp etc, but just can't get it out of econ mode?

Any thoughts?

[Tame Technician]

Most likely either pressure sensor or compressor.

Need to check the MVB for what pressure the A/C ECU is seeing from the high pressure sensor.

Who did the A/C service, would have taken mins to check this at the same time.