HMS_0500_0300_0001_0002 toolhead error

Bambu Lab P1 Series Troubleshooting
1

P1S with about 1000 hrs printing on it.
just stopped mid print. wrote it off as a failed print…restarted and im now getting HMS_0500_0300_0001_0002 error. tried everything in the wiki; no dice.
i’ve opened a support ticket…anything to try in the interim?

i’ve also reseated every cable on the toolhead. removed rear panel and checked all connections there.

printer will power up…AMS lights will blink double red…i’m being prompted to updated firmware (attempts to update will fail)…and the chamber fan just seems to spin at 100%.

im unable to turn that fan off/on…front panel seems to think the fan is off…

any help is appreciated!

2

You may be chasing that one for a bit.

Have you tried updating through Handy? Try that first.

I’d open a ticket, and in the meantime check all connections to the boad on the toolhead. Fan, part fan, thermistor, and heater.

3

update fails via handy as well…

the strange thing to me is when i power on the printer, fan inside fires up to 100% (super loud) despite the app/panel/etc all showing the fan off

something def went south on me…

4

machine assitant in handy app alerts
“The toolhead is malfunctioning. Please restart the device.”

restarting does nothing.

5

for anyone else battling this now or in the future…so far BL support has responded … pretty much asked for pics of the cable connections on the tool head…and suggested i run thru the wiki (which i did before opening a ticket).

more updates to come?

6

they have a script they have to run through. The only thing that will drive you nuts is the time difference. Is what it is.

7

Hi Justin,
I have the exact same problem. It happened once and I changed the toolhead cable. printed fine for a while after that and now I get the exact same symptoms you have: aux fan 100% and the same error. Also triple checked all the connectors, no luck

8

So support responded with the suggestion to remove the connectors from both sides of the toolhead, which I did. In that process I also removed the complete board on the back of the toolhead and reseated the toolhead cable connector. I don’t know which of that did it, but it looks like it’s working again!

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