Fixed a leak on a less than year old Trane unit, fired it up and watched it. Unit is on stilts so electrical is at head level. Right about the time I was going to take panel off and pull gages. BOOM! Contactor let loose. Almost made me soil myself because I was watching a payloader pass by and I of course was not expecting it. Sounded like a shotgun blast and shook the panel pretty good. Glad I had the panel on because The side of my head would have looked similar to the panel.
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It just basically blew the contact points out for no good reason. Nothing major or massive burnout, just too close for comfort.Checked all electrical, changed contactor, monitored and left.
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Stay safe out there