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Post the video here.

I have a Tempstar N4A3 2.0 Ton 13 SEER Single Stage Central Air Conditioner, about 5 years old. About 4 times this season and last year, it would start an extremely loud electronic sounding buzz.  I recorded the sound on my phone. I couldn't pinpoint the source when I stood at the unit. It stopped when I turned off the AC. The tech from the HVAC company we bought it from thought it might be the blower but wasn't sure. He checked the amps. He said he'd talk to the more senior guys at work and play the sound for them. That was 4 days ago and I haven't heard back.
Any ideas?

Perfect, thanks again

They released that addendum after the fact.

I also attached the CMA15 line set sizing chart.  Most people assume you have to use 3/4" copper but you can save a fortune using smaller sizes.

Wondering why this option isn't on the installation manual, wondering where you get it. will try it, thanks admin

Flip dip switches 2 & 3 ON.

Wire C & Y2.

Trying to wire this to furnace with 24 volts thermostat

Is any of you have experience installing mars comfort air centralized ac? How can I wired outdoor unit using regular 24 volt thermostat? Attached is the wiring diagram of the unit?

Sounds like the evaporator drain delay after a call for cooling to me. That or you've accidentally set it so low it seems off.

Are you using an Infinity thermostat? It may be stopping the continuous fan in order to control humidity.

Try disabling the dehumidify option and see if the continuous fan operates normally.