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"rear fan failed" error at the beginning of print  

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Piranha
(@piranha)
Trusted Member
"rear fan failed" error at the beginning of print

I assembled the SL1 kit myself and everything works except for the "rear fan failed" error.

 

Support only helped me with the advice to check the fan continuity with my multimeter, and there is continuity.

 

Any ideas?

Posted : 23/08/2019 2:19 pm
Henry Casson
(@henry-casson)
Trusted Member
RE: "rear fan failed" error at the beginning of print

In the Hardware/firmware thread you will find two more examples of rear fan problems. Given the small number of delivered printers this may point to a general problem. In my case support recommended factory reset and reflash the firmware, even though it was the latest. I did this from a USB drive, since the flash firmware menu choice will not do it if it  does not see a newer version. After the factory reset you need to reestablish your network access. In my case the fix did not do anything, and Support have gone silent.  I have little doubt that they are chasing down a problem before sending us replacements.

Attachment removed

Retired doc, should have been an engineer.

Posted : 23/08/2019 3:42 pm
Piranha
(@piranha)
Trusted Member
Topic starter answered:
RE: "rear fan failed" error at the beginning of print

Do you know if I can print even with that error?

 

Or will.my rear fan not be spinning and my printer overheats? What is that fan cooling anyways? 

 

Doesn't it suck in air for the printer?

Posted : 23/08/2019 3:50 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: "rear fan failed" error at the beginning of print

to the best of my understanding the fan on the back draws air out of the printer, filtering it through charcoal on the way... 

so without it your machine may overhear, or probably more likely bearing in mind there are two other fans on the case, simply leak air around the  edges instead of through the filter.

 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 23/08/2019 4:21 pm
Piranha
(@piranha)
Trusted Member
Topic starter answered:
RE: "rear fan failed" error at the beginning of print

ah okay. Ye so it's potentially risking health damage if I don't filter the fumes as well.

 

Most importantly: who is that in your picture?

Posted : 23/08/2019 4:25 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: "rear fan failed" error at the beginning of print

the profile picture is Me...  (it's quite an old picture...)

This is more recent

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 23/08/2019 4:37 pm
Martin L. liked
Piranha
(@piranha)
Trusted Member
Topic starter answered:
RE: "rear fan failed" error at the beginning of print

And here is me thinking I only meet 22 year old male nerds in this forum.

 

Thanks for the help, lady!

Posted : 23/08/2019 4:39 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: "rear fan failed" error at the beginning of print

Good to be able to help, 

Us old crocks have to have something to keep us amused! 

I keep claiming to be 21 still...   so not far off 22...     

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 23/08/2019 4:46 pm
Piranha
(@piranha)
Trusted Member
Topic starter answered:
RE: "rear fan failed" error at the beginning of print

Haha!

Posted : 23/08/2019 4:46 pm
Piranha
(@piranha)
Trusted Member
Topic starter answered:
RE: "rear fan failed" error at the beginning of print

Here is the log file for the error btw

Attachment removed
Attachment removed
 
and here better formatted:
 
 
Attachment removed
This post was modified 5 years ago 2 times by Piranha
Posted : 23/08/2019 9:53 pm
Henry Casson
(@henry-casson)
Trusted Member
RE: "rear fan failed" error at the beginning of print

I saved a couple of log files as well, but could not read them, not being an Unix person. Do not seem to contribute much. 

Retired doc, should have been an engineer.

Posted : 23/08/2019 10:28 pm
Piranha
(@piranha)
Trusted Member
Topic starter answered:
RE: "rear fan failed" error at the beginning of print

That log file was too short. Here is a longer one.

 

Btw the issue seems to be fixed. I downgraded the firmware from 1.2 to 1.1.1!!!!

Printing since 5 minutes!

 

 

Attachment removed
Posted : 23/08/2019 10:35 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: "rear fan failed" error at the beginning of print

that's odd...

I have 1.2.0 on my SL1...

I believe Prusa changed the Fan drive to a pwm  value in the latest firmware 

have you had a chat with the helpdesk? they can read the error logs too...  

Glad to hear you are able to run an earlier version of firmware. 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 24/08/2019 12:13 am
Piranha
(@piranha)
Trusted Member
Topic starter answered:
RE: "rear fan failed" error at the beginning of print

Here is the complete log

Search for this line

 

Jul 25 14:55:44 prusa64-sl1 SL1FW[347]: DEBUG - sl1fw.libWebDisplay - data: '{'page': 'confirm', 'text': "Failed: rear fan\n\nPlease contact tech support!\n\nExpect overheating, but the print may continue.\n\nIf you don't want to continue, please press the Back button on top of the screen and the actual job will be canceled.", 'save_path': None, 'image_version': '1.2.0', 'page_title': 'Confirm', 'net': True, 'command': 'showPage'}'

 

Attachment removed
Posted : 24/08/2019 12:43 am
Henry Casson
(@henry-casson)
Trusted Member
RE: "rear fan failed" error at the beginning of print

Just had an email from Simon Doubek, support. He asked for my order number, so as to send a replacement. 

Retired doc, should have been an engineer.

Posted : 24/08/2019 12:58 am
Piranha
(@piranha)
Trusted Member
Topic starter answered:
RE: "rear fan failed" error at the beginning of print

What was your problem with the printer?

Posted : 24/08/2019 1:03 am
Henry Casson
(@henry-casson)
Trusted Member
RE: "rear fan failed" error at the beginning of print

Just the fan, not the whole thing🤔

Retired doc, should have been an engineer.

Posted : 24/08/2019 1:25 am
Piranha
(@piranha)
Trusted Member
Topic starter answered:
RE: "rear fan failed" error at the beginning of print

Ah!

 

Rear fan as well? Sorry I must've missed one of your posts. I'm not aware of what problem you had. 

Posted : 24/08/2019 1:26 am
Piranha
(@piranha)
Trusted Member
Topic starter answered:
RE: "rear fan failed" error at the beginning of print

To give an update to this: support said it's a bug and can be ignored.

 

Posted : 27/08/2019 12:09 am
Raj
 Raj
(@raj)
New Member
RE: "rear fan failed" error at the beginning of print

I built mine from a kit and also had the failed rear fan error. I was still able to print successfully by going to advanced settings and setting the rear fan speed to zero and then starting a print. 

The next day I removed the rear fan and removed the filter so I could clearly see the fan blades and not impede any fan motion. The blades could spin easily by hand but still wouldn't spin during power-on testing. I then cut my wire ties and unplugged the fan, rerouted it a bit and tried it again and it worked. I then reassembled the case and reinstalled the fan and of course it didn't work again.

Deciding it must be an intermittent connection (either the wire had been nearly severed, or the connector had an issue) I completely removed the fan and got out my strong magnifying headset. The wires were in pristine condition. I then carefully removed the contacts one at a time from the connector and it turned out the the wires had been stripped too short and the crimps were therefore unreliable. They held fine when I pulled on the wire because the crimp on the insulation was very good.

I didn't have any spare contacts here so I very carefully soldered each (using the magnifier) so as not to let any solder wick into the working end of the connector. 

After plugging it back in, everything worked great and manipulating the wires even with the fan running had no effect.  I reassembled the cabinet and everything still works great.

I don't think most people would want (or have the experience necessary) to perform this fix by themselves but I work with very fine hand soldering every day in my job and have quite a bit of experience with connectors too so it worked fine as a fix for me.

Very long story short, in my case it was bad connections at the connector contacts. If that is the case with yours, you may want to look into getting a replacement or compatible fan.

Getting continuity on the leads is not a complete indicator of a good fan since getting the connector into position to get the meter probes on it could cause an intermittent connection to show as good when it is not. At the very least you would want to move the leads around randomly while you measure the continuity to see that it is a solid reading and not intermittent.

Posted : 11/10/2019 4:27 am
AndrewH liked
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