I've been experiencing a temperature display issue with my boat's AC system. It has a Cruisair Q3 display/control with the Cruisair Q-logic Control retrofit system connected to a Marine Air Systems VR12K-H AC/reverse heater. The boat has two systems and this one is located within the forward stateroom. My issue is this, when the HVAC unit is turned off at the display the temperature displayed is the correct temp inside the forward stateroom. This has been verified with an independent room thermometer. As soon as I turn the unit on, the displayed temp begins to climb until its 7-10 degrees above the actual temperature. This tell me that sensor itself is reading correctly when the unit is off. Other than that and a small heat issue, the system works fine I have completed the following troubleshooting of the problem, none of which have identified or corrected the issue. 1. Recalibrated the temperature setting. 2. Reset system to factory defaults. 3. Swapped the Q3 display/controller in the state room with the Q3 Display/controller in the Salon. I am beginning to think the that the issue may reside with the Q-logic Control/Power board, but at almost $300 a pop, I don't want to just start switching boards to find that that might not be the issue. One additional note, I typically kick on the heat cycle one per month as recommended. Currently, the system will not produce heat. I initially thought that this might just be a stuck reversing valve, but after tapping on it, I still could not get it to reverse. It just dawned on me that both the heat issue and temperature issue occurred around the same time frame and might be related. Has anyone experienced similar issues? Any thoughts? Thanks, Ron