I need some guidance to help my AC man...

[the dangling wrangler]

B

PS This is rather like a detective story - what fun!

You wouldn't think like that if you had to work on these machines all day, every day.

[everythingair]

sounds like a bad time delay......


could cause the symptoms you were describing.

have him look at contactor, many times a bad time delay will damage the contacts if it has been chattering.

My thoughts as well. Especially if the larger system is using one of the earlier scroll compressors when manufacturers installed the time delay relays to prevent them from accidentally running in reverse due to a rapid off/on cycle.

[beenthere]

Theres that highly top secret technical term "thingy". LOL

It may have been the problem.