In article s.com,
notmcguyver wrote:

Why would an apartments central AC units compressors run cap blow up &
start fire of wiring?
a tenants AC went down & that's what I found when I got up on roof. Is
is a lack of maintenance issue?

Or, use of the wrong kind of capacitor. Motor-rated caps come in two
flavors, X and Y (if memory serves), and one of them is guaranteed to
fail open.

I'd check that the cap used matches what the AV manufacturer specified.

Joe Gwinn