Fan bearing heating up
hydrogen boiler infrared thermal imaging hydrogen boiler visible light
Visible Light Image
This is the fan inboard bearing starting to show some heat. This could be a dry bearing or it could be that the belts are too tight pulling the shaft therefore placing stress on the bearing.
 
We checked this bearing with ULTRASOUND and it was found to be a dry bearing. We greased it just enough to make it quiet and it cooled right down.