DF15hp warning light and safe mode

[Ktmjerry]

I have a DF15A tiller outboard. It has been sitting for a while. It starts immediately and idles, but when I put it in gear and rev it, it goes into safe mode and the warning light goes on. It has new oil, water coming out of the pilot hole. It cools down and then does it again. Any ideas?

[Moonlighter]

How long has it been sitting? A water pump impeller can get a set in it if left unused for a long time. It might pump OK at idle speeds but not at revs.

[Hoosmatroos]

Take a look at the thermostat. Maybe this is stuck. Clean and test in a cup with some hot water.