All fans permanently running at 100%

General Discussion
1

Basic Information:

Printer Model: Homebrew coreXY, heavily based on HevOrt
MCU / Printerboard: Printerboard: BBT Octopus 1.1
Host / SBC: Raspberry Pi 3 Model B Plus Rev 1.3
klippy.log (387.2 KB)

Describe your issue:

I just encounter strange behavior regarding my fans.

After a succesfull print my fans keep running on 100%. This affects all fans: partcooling, hotend and MCU cooling.

Sending M106 S0 or moving slider in Mainsail does nothing, rebooting (Host/MCU) does nothing, power cycling does nothing (fans immediately come up again with poweron).

Updating Klipper to version: v0.12.0-272-g13c75ea87 changed nothing, and yes mcu and mcu pi were flashed to same version.

Nothing was changed in configuration nor cabling.

Just after the successful print the hotend fan didn’t stop when the temperature felt below 50°C. After having a closer look, i realized that the partcooling fan was stuck on 100%.

I already had this behavior with the partcooling fan a few times, but restarting the firmware always solved the problem.

I then had a look on the mcu fan in the electronics compartment it was stuck on 100% also (configured not to exceed 33%!).

So it’s unlikely to just have a broken mosfet, since three of them are involved and had to break simultaneously to get the effect.

Any idea what to check for further investigations?

2

I changed the fans to another set of fan connectors:

     fan0 --> fan2
     fan1 --> fan3

and changed the pins in the configuration according to this.
Everything is back to normal now, including the mcu fan in the electronics compartment.

Attaching another fan to the now unconfigured connectors fan0 and fan1 does nothing, that fan stays off.

Since everything is working as expected now, i consider the Topic as solved, but the background - why this happenend - is quite unclear.

:thinking:

1 Like
3

@Sineos

I’m sure, i’d be able to gain another like, if i put everything back into place to confirm whatever the outcome might be - but i’ m not curious enough, since i plan to swap out the Octopus by a Manta M8P in a few weeks when the whole printer gets a facelift…

4

Heh, honor to whom honor is due.
Feedback on solutions is always appreciated, especially when it is a strange issue, where the root cause is not apparently clear.

2 Likes
5

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