Compressor fault
When you alter the height settings front or rear the system will automatically do a self test, if any faults are detected it will through up a fault code. If you aren't experiencing any other fault with the system then it may not be the compressor. I did however come across a similar fault on a Range Rover and it turned out to be a front height corrector (sensor on the suspension arm) sending an implausible signal to the control module when it got to a specific height. The sensor didn't show at fault when I read the faults, only a vague random signal fault. What code or codes are you getting?
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