¶ What it is
There is a speed feedback signal from the part cooling fan. Normally, when applied a voltage, the fan will perform a corresponding spinning speed, and the printer will check the feedback speed and see if the fan is working normally. If the feedback speed of the cooling fan is slower than designed, this error message will occur.
Below are the possible reasons:
- The fan blade is stuck by something ( like filament strings ) and cannot spin freely
- The part cooling fan connector is loosened
- the fan is broken
¶ Safety warning and Machine state before starting operation
If the fan is turned on, when cleaning the fan, the fan may start spinning suddenly and cause injury. So make sure the fan is turned off when starting the following step.
(a screen picture here, left is the fan on, right is the fan off)
¶ Troubleshooting guide
¶ step 1
Turn off the fan, and spin the fan blade manually, to see if it is stuck by something. If yes, clean up, then turn on the fan again to see if the fan returns to normal.
¶ step 2
If step 1 does not work, then check if the connector is loose. Plug and unplug the front shell connector, then try turning on the part cooling fan again.
¶ step 3
If step 2 still does not work, then it is possible that the part cooling fan is broken. Click here to see how to replace the part cooling fan.
¶ Error message
HMS_0300-0400-0002-0001: The speed of part cooling fan is too slow or stopped.
"The speed of part cooling fan is too slow or stopped."
0300-0400-0002-0001
¶ End Notes
We hope the detailed guide provided has been helpful and informative.
To ensure a safe and effective execution, if you have any concerns or questions about the process described in this article, we recommend submitting a Technical ticket regarding your issue. Please include a picture or video illustrating the problem, as well as any additional information related to your inquiry.