Inspect cell light is on and low salt

If the cell is in need of cleaning it can cause the salt level to read lower than it actually is. But if you have testing that also shows low salt, then you may need to add salt. Clean the cell then check the instant salt reading.
 
2700 is borderline of what the SWG can operate at. Keep in mind also, that the SWGs salt sensor as well as any sort of salt test kit have inaccuries of a couple hundred either way. It may actually be a little lower or a little higher.

Almost all SWG manufacturers 3200 to 3400 ppm as ideal, but can operate a little higher or lower.

If I were you, I would add enough salt to get it from 27 to 32 and see if the low salt alarm goes away.
 
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