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Carrier Ideal Day 10 Dehumidifyer inop. Fans work ok but A.C. Inop?

Hi, I have a Carrier Ideal Day 10 mobile Air Conditioning unit *early 18 style with turn knob rather than digital type* Fan blower works on slow and fast but not dehumidifying.
Any known common problems, i.e. loss of gas, compressor, switch etc
Many thanks in advance for any help
Paul, July 2009