What is the problem?
i've aaded a poe hat to my rasp 4b, running optopi, but the fan dosent run even when the temp gets above 75
Found the solution 
Updated the pi firmware and added these lines to the config
dtoverlay=rpi-poe
dtparam=poe_fan_temp0=10000,poe_fan_temp0_hyst=1000
dtparam=poe_fan_temp1=55000,poe_fan_temp1_hyst=5000
dtparam=poe_fan_temp2=60000,poe_fan_temp2_hyst=5000
dtparam=poe_fan_temp3=65000,poe_fan_temp3_hyst=5000
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