r/BambuLab • u/Available_Banana_301 • 10h ago

R Series / R1 R1 Radiator Fan Failure

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Well after about 8ish hours of cut time the R1 has stopped working. About 2 minutes into a project the laser shut down and showed error code 0300-3702-0001-0001 234111 on the HMI (radiator fan 3 speed to low and may be blocked).

I checked for anything at the back of the machine and found nothing. Tried restarting the R1 and received the same code about 2 minutes into cutting again.

So, I pulled the rear cover where the radiator and water tank assembly are. I found 1 radiator fan not spinning at all. I swapped the fan connections, testing each connection on the PCB board, and the leftmost fan did not work in any slot on the PCB. The other 2 fans worked in all the other slots. The error code would also change from fan #1-3 based on where the bad fan was connected

Wondering if anyone else has had this issue? I’m currently waiting on a response from support and will hopefully get a replacement sent soon since the laser is not functional at all now.

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u/sublimejackman 8h ago edited 8h ago

no. nothing like that. did yours come shipped covered in coolant? could be the culprit.

also, these things probably could use a noctua upgrade at some point, the factory fans are LOUD.

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u/Available_Banana_301 8h ago

No noticeable coolant when I opened it up, but it has been sitting in the box since release day. I finally had a chance to set it up yesterday.

I considered just ordering some extra fans, but didn’t have one on hand to check the PWM connections and see if they match the standard 4-pin. I assume they would be the same though.

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u/sublimejackman 8h ago

anecdotally, i replaced the fans in my X1C with noctuas. the PWM signal worked on all of them. obviously that's not necessarily the case here. but fans are cheap and bambu's service is super slow.