Unfortunately for us that can't afford a brand new 200K+ boat we are lower on the priority list. Which is understandable. I tried getting some new guages, gel work, front step, and interior work on my fundeck. Times are good for boat builders right now.
By valve I'm assuming the angle stop, which is the valve under the sink that the supply line is connected to. Still the same supply line and faucet? Have you tried to turn the valve on to make sure you are getting water to the valve and eliminate the faucet and supply line? If no water there...
I'm no HVAC expert by any means. With that said a lot or very little goes into correctly setting up the unit from the get go. Correct duct sizes both supply and return, when the unit was installed depending on the temp outside could affect the refrigerant charge to really dial the unit in. I...