Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Carrier condenser unit, loud buzz on start
I noticed our 2011, 16 SEER, 3 ton Carrier condenser unit has an audible buzz on start up then it quiets down after 3 seconds. The buzz wasn't always there, just since last summer. I wouldn't be thinking about it right now if it weren't for the unit not starting on t'sat demand last night (neither fan nor compressor but I could feel fan trying). I replaced the start capacitor and everything fired right up and has been working fine since. Initial buzz is still present. Air temp out of vents is around 65-68 deg F.
It isn't the contactor or loose metal. It sounds like the compressor struggling to start. Is this normal with age?