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Fan Problem MK3.5S  

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Raph_38
(@raph_38)
Member
Fan Problem MK3.5S

Hello,

I've received my MK3.5S upgrade kit and I'm having a problem with the fan not being recognised. The test is not running (fail) .

What is strange is that the fan is working correctly.

- The hotend fan runs during the test- The nozzle fan rotates during the test.

 have done a test print ignoring the fan check and everything is OK.

i'm started from a FYSETC Bear MK3S base to the MK3.5S upgrade.

I flashed the firmware with the latest version.

Can you help me?


This topic was modified 7 months ago 2 times by Raph_38
Posted : 03/02/2025 10:20 am
htfan
(@htfan)
Active Member
RE: Fan Problem MK3.5S

I'm now having a similar fan self test issue. While upgrading to the Mk3.5s from a stock Mk3s my stock hotend fan's brittle old wires broke so I replaced with a FYSETC fan because it was readily available on Amazon. However, the new fan fails RPM self test even though it seems to work fine.

As a test, I repaired/spliced the original stock broken fan wires and ran the fan RPM test again and it passed. However, I don't want to reassemble with the old fan because the wires are too short now.

Posted : 26/03/2025 3:19 pm
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