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    Marine Aire (Dometic) 18,000 BTU HVAC freezing

    Our 2009 Hunter 38 (Mariner Package) has a Marine Aire (Dometic) 18,000 BTU HVAC unit in the main salon and had a similar 6,000 BTU unit in the aft cabin. Both use separate Dometic Passport I/O Digital Controls. The aft unit was not working at all when we purchased the boat in October 2020, so...
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