How hot is hot? Perhaps you just aren't getting hot enough to trigger the fan?Hello,
I have a fan for the Raspberry Pi 5, but it has four wires that connect to the FAN port. How do I turn on the fan?
I've tried adding this to the `/boot/firmware/config.txt`:
```
[all]
dtoverlay=gpio-fan,gpiopin=18,temp=55000
```
The fan I have is not the official Raspberry Pi fan, it is the one included in this case at the link below. The Amazon page claims it has a PWM, but I don't know how to turn on the fan. I am sure it has power, because it turns on briefly when rebooting, but the Raspberry Pi is still hot most of the time and the fan does not turn on.
According to the official documentation...here
https://www.raspberrypi.com/documentati ... heat-sinks
"As the temperature of the Raspberry Pi 5 increases, the fan reacts in the following way:
below 50°C, the fan does not spin at all (0% speed)
at 50°C, the fan turns on at a low speed (30% speed)
at 60°C, the fan speed increases to a medium speed (50% speed)
at 67.5°C, the fan speed increases to a high speed (70% speed)
at 75°C the fan increases to full speed (100% speed)"
I have the official RPI active cooler. I've left it as default and it seems fine.
Have a look here for an explanation of each one of the fan parameters in config.txt
/boot/firmware/overlays/README
Statistics: Posted by kip_the_elder — Sat Jul 12, 2025 10:10 am