u/Grand_Dot6364

About a month ago, my HVAC company replaced the compressor in my AC unit. The AC stopped working again already, and they came back out today.

Their report says:

• compressor has “extremely high resistance”
• common terminal is grounded
• capacitor, contactor, wiring, and breaker all look good
• no refrigerant leaks found

They mentioned it could be a manufacturer defect, but I’m trying to understand whether this is normal for a compressor that was replaced just a month ago.

A few questions:

• Does a grounded common terminal usually mean the compressor has failed?
• Is it common for a new compressor to fail this quickly?
• Could installation issues or another system problem cause this?
• What should I ask them to check before replacing anything again?

Just looking for advice from people with HVAC experience before I move forward.