Hey, I’m work on a Mitsubishi multi city R2. Cooling and heating in all zones is working fine. However, after unit gets running and meets load demand a loud whistle/humming sound is accruing and I can’t seem to track down issue. I used a magnet to check exv but they all seem to be opening. Not sure which direction I should go from here. Any help would be greatly appreciated.

Posted by Dmort650 at 2025-03-30 05:25:57 UTC