[BUG] 3.14.1 - self test problem - filament fan error

[dturak]

Printer model

MK3S/+

MMU model

No-MMU

Firmware versions

3.14.1

Upgrades and modifications

No response

Printing from...

SD Card

Describe the bug

during the self-test and fan checking, the first hotend fan passes correctly, however, during the filament fan test, a message pops up asking whether the fan is spinning, after confirming that it is, an error pops up and the self-test is interrupted.

I have a REVO hotend but I checked on every version 3.14.1 and on version 3.14.0 and the effect was the same. Only when I installed version 3.13.3 the test passed successfully

How to reproduce

start self test -> when asked if the fan is spinning, select that it is spinning -> an error appears on the screen

Expected behavior

when it is confirmed that the fan is tested successfully, the fan test is completed and the next step of the self-test is performed.

Files

No response

[3d-gussner]

Thanks for the report.
When the part cooling fan test fails you get two questions to be answered correctly:

Fan test
Left hotend fan?
 Spinning
>Not spinning

after confirming that the left hotend fan is Not spinning you get

Fan
Front print fan?
 Spinning
>Not spinning

Both selections are default set to Not spinning

Please ensure that you select on the first question Not spinning as the hotend fan passed the test
AND
select Spinning for the Front part fan.

I just tried to simulate your issue and the only way I got an error

Selftest error!
Please check:
Front/left fans
Swapped

when I selected Spinning at the first question for the left hotend fan.

[3d-gussner]

As the fan has been detected correctly in FW 3.13.3 I would suggest to check if the fan still works.
Is it a stock Prusa part cooling fan or do you use a 3rd party fan?

Troubleshoot fans:

• Set in LCD menu Settings -> Temperature -> Fan speed: to 255
• In LCD Support menu -> Extruder info you can see the detected RPM of the fans
• To trouble shoot the hotend fan you can set the hotend temperature above 56 °C in the Settings -> Temperature -> Nozzle menu

My printer shows
Hotend fan: ~ 3720 - 3900
Print fan: ~ 4440 - 4560

The MK404 SIM
Hotend fan: ~ 3240 - 3300
Print fan: ~4440 - 4740

Don't forget to cool down after troubleshooting.

You can also connect via USB to the printer and use M155 S1 C2 to show the detected fan RPM and