I know I am about the million person to ask this :-), but I read all the relevant threads and didn’t find anything that worked.
Fresh installed, everything works great besides the fan. No mater how I configure it, I can always hear it (meaning it’s always working) regardless of the CPU temperature, which is below 40C.
I don’t know how to measure the HDD temp, although I am using 2 SSDs so I am less concerned about that.
NB: the RPI board was previously used in an Argon ONE case, and I installed the Argon ONE script on it. Yesterday I ran an uninstall and installed the EON script, but there might be some kind of leftover somewhere that’s causing the problem.