Fans & cooling

Inspect the cooling hardware your PC exposes and configure supported fan controls.

Check your fans first

Open Fans in the top navigation.
Read each fan’s hardware name, temperature and temperature source, RPM and control status.
Enable Show all fans to inspect hidden idle channels.
Leave the fan on Auto while identifying it. Rename a generic header when you know what it is connected to.

English Fans page showing fan hardware temperature RPM and Auto Custom controls — The English Fans page with administrator sensor access. Read each hardware name, temperature and RPM before changing its control. Open the image for a closer look.

Auto and Custom

Mode	Behavior
Auto	The hardware firmware owns fan speed. This is the default.
Custom: temperature curve	Speed ramps from the fan’s minimum to maximum between your start and maximum temperatures.
Custom: constant speed	A fixed percentage within the range supported by that fan.

Configure a temperature curve

On a supported controllable fan, choose Custom. The editor opens beneath that fan.
Choose Based on a temperature. Set Start increasing at and Full speed at for your cooling setup, or choose Constant speed.
Review the fields and press Apply. Changes in the editor do not control hardware until applied.
Check the status: Custom control applied confirms the command took effect. Observe the temperature and RPM.
Choose Auto to return speed control to firmware.

English fan Custom editor showing Based on a temperature Start increasing at Full speed at Constant speed and Apply — The actual Custom editor in read-only preview. Monitoring only means this capture did not write a fan command. Open the image for a closer look.

A GPU fan follows its own GPU temperature. A motherboard fan follows CPU temperature. There is no Follow selector or cross-category fallback when that temperature is missing. Constant mode uses a fixed speed instead of a temperature ramp.

Understand the status

Status	Meaning / action
Firmware control	Auto is active and firmware owns speed.
Waiting to apply	The command has not yet taken effect.
Custom control applied	The custom command was accepted.
Temperature unavailable; firmware control	The required temperature is missing; control returns to firmware.
Driver refused custom control; firmware control	The hardware/driver did not accept the command. Use Auto and check support.
Could not restore firmware control; retrying	The release failed and Momo is retrying; check the cooling state.
Monitoring only	Readings are available, but custom hardware control is not active.
Stopped (0 RPM)	A valid zero RPM; it may be a device stop mode.
RPM unavailable	No valid RPM reading; this is different from a stopped fan.

Moving to another computer

Portable histories and general preferences travel, but fan profiles return to firmware Auto on another PC. Hardware-specific labels and calibration must be checked again. On a normal application exit, Momo releases software fan control.