In the case above,  poor connection at the pressure cycling switch  and also a faulty A/C clutch coil could be the cause.
The cause that hinders the A/C Compressor from engaging are:
Note that the pressure switches is known to be one that control the on/off function of any kind of AC compressor and as such, if there is switch failure, it can hinder the AC compressor from functioning at all.
Therefore, technician A and B are correct.
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