We have an AC system which has three air compressors, it's controlled by Engineered Air C-TRAC3 cooling controller. Only the first stage air compressor can start, no signal for the second and third compressor, and no air flowing out from the vents. Does anybody know what's wrong with the system? Thanks a lot.
source https://hvac-talk.com/vbb/threads/2241495-AC-not-working?goto=newpost
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