I have a 1994 Searay Sundancer 270 I am trying to get the a/c to work I plug it into shore power hit the breaker and automatically the fan turns on and it goes onto heat mode none of the buttons do anything on the control panel/tstat it just shows the temp but wont respond. I took it apart looked for water damage didn't see any clear damage but I assume that it is the problem since its from 1994 and orig to the boat. So what is the cheapest/best thing to replace it with or fix it? I have looked around on the internet but no luck here is a picture of what I have.
