Anycubic Kobra Plus -- Hotend and MCU fan always on

[EDACerton]

Basic Information:

Printer Model: Anycubic Kobra Plus
MCU / Printerboard: Trigorilla_Pro_A_V1.0.4

Describe your issue:

[controller_fan controller_fan]
pin: PA14
heater: heater_bed

[heater_fan heater_fan]
pin: PA13

On my printer, the hotend and MCU fans both go to 100% as soon as the printer starts up, regardless of the commanded status. Anycubic publishes the Marlin config for the stock firmware, so I know that the pins are correct:

//
// Fans
//
#define FAN_PIN                             PB9     // model fan
#define FAN1_PIN                            PA13    // auto fan for E0
#define FAN2_PIN                            PA14    // controller fan
#define CONTROLLER_FAN_PIN                  FAN2_PIN
#define FAN_SOFT_PWM

(Source: Kobra_Plus/source/Marlin/src/pins/stm32f1/pins_AC_TRI_F1_V1.h at master · ANYCUBIC-3D/Kobra_Plus · GitHub )

Does anyone have any ideas about why the fans don’t respond to control with Klipper?

[EddyMI3D]

Hello @EDACerton !

I’m missing that line that asks for the klippy.log.

Please attach it to your next post.

[EDACerton]

klippy.log (40.0 KB)

[Sineos]

You have not configured any conditions for these fans.
See

• heater_fan
• controller_fan

[EDACerton]

Right… I’m expecting the default behavior for both fans (heater runs when heater enabled, controller runs when steppers enabled).

Klipper shows the desired status, but the actual status doesn’t match (e.g., when I start the printer, the hotend fan says it is off, but the fan starts running at 100%. Same with the controller fan.)

[EDACerton]

Adding the solution for folks who might find this later:

I updated the MCU, and now the fans respond to control as expected.