I am dealing with a Bryant 3 ton 410a split system ac. Customer reported the AC making a loud banging noise on start up. I put my gauges on and started the unit. In the off position the gauges read 175 psi. On start up the suction drops to about 130 and the head runs up to about 275. Then after about 45 seconds the head shoots to 600 the unit makes a loud sound. Then the sound of the compressor changes and it returns to equalization but the compressor is running.
Whats causing this I realize the compressor is not pumping after the loud sound.