Radek

It will probably be better to disconnect the original Ender 3 V2 display and replace it with a BTT TFT display. There is no documentation available for the original Ender...

FAN1 is on pin 2.2 So you have to define the right pin. You should correctly define: #define E0_AUTO_FAN_PIN P2_02 

Looking at the wiring diagram, I wonder if there may be a fault in the wiring of the board. FAN1 connection is different from other MOSFET ... 

It also works for me, but I have another board (SKR 1.4 Turbo) and I use an external MOSFET to switch. There will be no mistake in Marlin.

Yes, my board does not have only one connector adjustable (switched) output for the fan. I have two hotends, 2 extruder cooling fans that switch above 50 ° C, a...

If you have a well-configured marlin, and yet your fan runs continuously, the PL4009 transistor on the FAN2 connector may be burned out. Can you measure the level of the...

If the transistor burns out, it can be permanently closed or open. Do you have set up and uncommented in Marla? #define E0_AUTO_FAN_PIN FAN1_PIN #define EXTRUDER_AUTO_FAN_TEMPERATURE 50 #define EXTRUDER_AUTO_FAN_SPEED 255...

Attention In the file Marlin\src\pins\lpc1769\pins_BTT_SKR_E3_TURBO.h comment the line // # define CONTROLLER_FAN_PIN FAN1_PIN

> Hey @radek8, > > I appreciate the support. Unfortunately, it did not work. > > The FAN1_PIN was already set to P2_02 in file Marlin\src\pins\lpc1769\pins_BTT_SKR_E3_TURBO.h @IceDragonix, Pin1 is already...

It looks like a faulty transistor on pin P2_02