If you have an NZXT CAM powered Fan Controller in your PC or an NZXT Motherboard, you may notice some fan headers may show a 0 RPM rating. This guide will help cover a few reasons why you may experience this particular reading.
No fan connected or a fan is improperly connected
The most common reason a Fan Connector will report 0 RPM is because a fan is either not connected to the header or it is improperly connected. The RPM number is provided from the TACH sense pin on either a PWM or DC fan. To start, it is recommended to check if the fan itself is detected in CAM.
If the controller detects a fan, you will see either a PWM or DC in the top-right corner of the fan curve. You can open the fan curve by clicking the Fan Connector panel in the Cooling tab.
If the fan is detected and you're seeing a 0 RPM reading, this could be due to an issue with the TACH sense pin on the fan or the controller. This is especially common if you are using a Fan Splitter such as those included with the RGB & Fan Controller.
When connecting multiple fans to a splitter, make sure that all fans are of the same type (do not mix PWM and DC fans on the same channel, as this can cause detection issues). For optimal fan performance, it is recommended to make sure all fans on a splitter are of the same model.
Most splitters will include only a single 4-pin connection with the others omitting the second pin. This second pin is the TACH sense pin and is required to get a reading. When connecting only one or two fans to these splitters, make sure at least one fan is plugged directly into this 4-pin connection.
If the fan is spinning and is still reporting 0 RPM, try connecting the fan directly to another known working port or try moving a known detected fan onto the potentially bad port. If a known working fan shows 0 RPM on the port, this could indicate that the controller needs to be replaced.
Fan Over-current Protection
Another common reason a fan may go to 0 RPM is due to Over-current Protection or OCP. This is a safety feature that will reduce or disable power to a device that is attempting to pull too much power through a given connector. For NZXT CAM-based controllers, this limit will vary from product to product.
For example, the NZXT RGB & Fan Controller (2022) has a maximum power draw of 12V 3A or 36 Watts across all three connectors, divided to 12W per channel. For more information, please refer to your user's manual or the product page.
Curve is set to 0
An extremely uncommon case is that the fan curve may simply be at 0 for your given temperature. This can be set manually using the Custom option from the dropdown and then adjusting the nodes to meet your needs. Some users will reduce fan speed to zero or near zero for reduce system noise.
Alternatively, the CAM software includes some pre-set speed profiles for Silent or Performance oriented operation.
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