My PTAC unit makes a "chugging" noise (like a choo-choo train) after it shuts off. This noise goes away when the unit turns on. It happens during heating. Not sure if it happens during cooling. Anyone have an idea of what it might be? Thanks.
source https://hvac-talk.com/vbb/showthread.php?2223553-quot-Chugging-quot-noise-after-PTAC-shuts-off&goto=newpost
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