First, thanks to all who responded to my questions regarding our CO sensor going off. Just an update, after we reset the sensors and vented the cabin we did not have any further problems that weekend. We closed up the boat and left that Sunday night. The next morning (two Mondays ago) I received a call from my marina. A mechanic was walking down the dock to work on another boat and heard the alarm. He investigated but could not find anything wrong. He reset the sensors and went about his business. I contacted my dealer (Sandy Hook Yacht Sales) and Greg at Hunter customer service. The service manager eventually emailed me to let me know that he also spoke with Greg and that Hunter would be forwarding me new sensors. Unfortunately they did not explain exactly why but I would conclude there must be a problem with the sensors. I have also installed a battery operated one (as suggested on this forum). Spent last weekend on the boat without issue. Quite sometime ago I responded to someones questions regarding the refrigeration system not working correctly and frosting up. I also had a problem since the boat was delivered in April 2002. Hunter eventually provided, under warranty, a retro kit to add insulation which was completed by my dealer in November 2002. This year we still experienced a problem with the unit frosting up within a week of turning it on to the point where the freezer would not freeze and the fridge was over 40 degrees. (Note that when we are at the dock or away from the boat I leave the AC on) I contacted my dealer again and copied Hunter. My dealer contacted an authorized service rep in Ct (Thermal Dynamics) who called and made an appointment to come and check the unit. He determined that there was too much pressure in the system, 18 lbs when there was supposed to be 6 lbs, that there still was an insulation problem and that the gaskets did not seal tight. He stated that at this point he would not do anything about the insulation as it might do more harm then good - expansion behind liner might crack it. I followed up with my dealer and they made arrangements with Hunter to send me a new gasket set. The service tech did reduce the pressure which seems to be helpng. We shall see. Again, thanks for all the impute. Bob