Yes, low voltage is also a possibility. I would get some kind of voltmeter that can be plugged into an outlet so that you can monitor line voltage. You are probably OK down to 108V, but running on anything lower is iffy as compressors don't like low voltage and these units don't monitor voltage. Maybe the newer ones with digital control do, but I can't verify that as my background is in marine air conditioners, not rooftops.
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