P38 suspension probs

my 96 p38 is giving me touble again! this time its the suspension - i have cleared all of the faults on the system but the compressor will not run! i have by past the power and the compressor runs fine but does not pump up the system eventhough left running for 15mins has anyone got any ideas?? - thanks

What were the faults you cleared? What did you use to clear them??