Psensor warning - What does it mean?

Solution 1:

In Psensor, by default, the high threshold of the alarm is set to 60C (and not 30C as you reported) for all sensors.

Obviously, 60C is not too much hot for most hardware components. You can set the threshold according to the specifications of your component to better match your needs.

By default, low threshold for fan is 0, if you have enabled warnings for fan and one is stopped or not wired, it will raise a warning.

When a warning is raised, you also have a bubble notification at the top right of the screen once allowing you to know the name of the component which is raising the alarm. Maybe you have enabled warning for a fan which is stopped or not wired?