Im having problems with a 170 ton 30rb chiller. The alarms are p.16-p.18 (compressor A1,A2,A3 not started or pressure not established). Ive logged all info in alarm history and the compressors fail on different days. Ive checked all transducers, control voltage, incoming power,ect without solving the issue.Since the problem only occurs with A circuit, I'm leaning more towards the com wire from the MBB ( J9C) to SPMA1 ( JP1) being the culprit. Would a loss of comm to SPM board be generated? Possibly a nick in the wire causing intermittent short. Another is possibly the dielectric grease on the press transducers. Has anyone else experienced these problems? If so, your info is much appreciated.