Hot horn

[Cocodrie]

Need to see if anyone has ever run across this issue.
I have a 2002 Yamaha SX250TRX outboard that Is having issues with the high temperature alarm going off. It will run great at all speeds but, when I slow down to come to a stop to start fishing, the high temp alarm buzzer comes on. It will buzz for about 2-3 minutes and then it clears.
I have checked the engine temperature with an in fared digital thermometer and and all of the cylinders are running the same temp around 90-92 deg.
At times if I am idling from one spot to another, the high temp buzzer comes on and then clears after a couple of minutes.
I recently had the water pump replaced by a local Yamaha service center, so I really don't think that is an issue.
I know there are a couple of temp sensors on the block, not sure if this would be causing the issue.
Any suggestions would be greatly appreciated.

[boats.net]

It could be from bad water pump, stuck thermostats, pressure control valve or blocked water passages in block. Best to start with water pump inspection and or replacement.

[Bluefish]

If your shore your water circulation is good pull out your sensor I had salt some built up salt behind mine once causing the alarm when alarm goes off unplug each one to see witch is faulty. Sensors make the ground to trigger