Look for the two wire plug on the condenser/dehydrator (silver canister looking thing). Disconnect it and connect a jumper (paper clip or similar) across the loose end of the connection. Try that prior to adding refrigerant -- those switches seem to fail fairly often and you may not really be low. The switch is on a Schrader valve, and can be replaced without discharging/recharging the system.
Good Luck, Mark Sparge
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