I had same issue, after recently moving(buying) here a couple years ago. I called Munns, technician came out, and told me almost exact same thing as they told you. Then, their office called and tried to sell me a new unit(mine was 7yrs old). I also had my split unit in lanai go, and same tech quoted me parts and labor for 3 different parts??? (NOTE: Kind of unusual for 3 parts to all go bad?!) Needless to say, I called someone else(independent contractor, also a Vet), who was a nice young guy. He lifted the humidistat, showed me where it fills with water(shuts down the system), drained and cleaned it, and PRESTO! Everything works! NO 3 bad parts! For the main unit, it was a capacitor. No need for a new coil, etc. And no more Munns!
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