HELP----AC fan blows when thermostat is set to OFF

I was looking thru the net at some old similar issues on other setups and one indicated that they replaced the control board (in the ac unit - under the label that you pictured earlier... its not cheap though). There problem was similar that the ac compressor was running and could only stop it by pulling the breaker / fuse.

here is the "example"

http://www.irv2.com/forums/f54/dometic-duo-therm-low-profile-ac-111902.html