V220 rear suspension

[Hugh Fixsen]

Hello all, I'm a new member. I have a UK 2001 V220 converted to a camper. The rear air suspension has stopped working after blowing the fuse about 4 times over about 3 months. The compressor does not operate at all now (Though I don't think it's broken). I have had a look underneath and nothing seems broken, the fuses are intact. Is there a relay that could be causing this failure, if so, where? Are there any other probable reasons? How should I check the system for fault finding.
Thanks in advance,

Hugh.