Suspension light saying Normal height only

Hi, my 06 Discovery 3 has this message coming up. Any ideas how to diagnose the actual fault, it went up and down ok yesterday but now dashboard light back on showing above.
Thanks

You may have a problem with your air compressor.

You may also get 1 that says “no height changes while system cools” (something like that)

Our 322 has started doing same and gave a fault C1A20-64 on diagnostics.

So for me it’s a compressor rebuild and new desiccant and filters.

There could be a few faults that show that message not sure, so you really need to pull the fault code.

J