GG,
There is a switch on the drain line. You should be able to check the drain, take the cap off, use a funnel, and pour a cup of water in the drain. If it drains, you should be OK. If it does not, the drain is plugged, and the switch operated to avoid damage to the AC.
VT
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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