Steve

I have a self contained 2000 8000 btu marine air unit in our state room with Passport control head. When we turn on the heat mode it will run fine for maybe 20 to 30 minutes and then we will notice that ambient air is coming out of the duct.  I will turn it off for 15 to 20 minutes, then start it up and it will repeat itself. I have not notice this to happen in the cooling mode, just the heat. Water flow is good. Any thoughts or what other info might you need.

Mike

Steve

Water temp in 40's probably, Chesapeake Bay, outside temp 40's also. Aft stateroom 54, set point 65. Temp showed 61 when it cut out.

By the way the salon unit, 16000 BTU, which has never had the problem was set at 70 and holding temp. Also this problem has been an ongoing one with the heat and have put up with it. Time has come to try and identify the problem.

Mike

Also….Instead of manually shutting off when blowing ambient air…Wait for say 20-30 min to see if you get a fault code on the display…Some faults need/cause several (3-4) restarts before shutdown & display of a fault.

Shutting off manually may be interrupting this process…If it will display a fault, I can better tell what is happening without gauges connected.

Steve~