New H2S Won't Connect to AMS2 -- No help from Support

Bambu Lab H2 Series
1

Bambu Support is utterly terrible so I’m hoping maybe someone in here has seen and resolved this issue before while I sit in support purgatory.

I received a new H2S combo earlier this week and upon setting it up and connecting the AMS2 received the following errors:

“AMS A The assist motor phase winding has an open circuit. The assist motor may. be faulty.”
and
“AMS A certification failed. Please reconnect the cable or restart the printer”

The first time I connected it, the AMS2 immediately showed up on the H2S touch screen GUI, but with the first message listed. Eventually the 2nd message about certification showed. Now, when I connect the AMS2 unit, the H2S will not even recognize it/won’t even show any error messages. It’s like the problem progressively got worse.

At first I thought this pointed to an issue with the AMS2 unit but being the owner of multiple A1s and an X1C combo I decided to try to narrow down the problem unit.

  • Connected the new AMS2 unit to my X1C and it synced up and works normally
  • Connected my old AMS1 unit to the new H2S and it does not work, with similar symptoms to what I’m seeing.

I feel like this is pointing to an issue with the H2S mainboard or whatever connector is being used to interface the H2S with the AMS 6-pin port. I have put all this information into a support ticket with Bambu but I am now over 4 days into it and have not received any response at all.

This is a terrible way to treat repeat customers who have obviously received a defective unit. I somewhat get support delays especially for situations where something being messed up could be the fault of the user performing non-ideal actions or something…but we’re talking about a brand new unit that is messed up upon arrival. These should be prioritized…anyway, enough venting about Bambu, hopefully someone else has seen this :frowning:

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2

Is this with, or without any spools loaded in the AMS?

3

Upon connecting the AMS2 to the H2S, after the brief startup on the AMS2 all 4 slots go to error state (all slots flashing red light off/on) and it will not pull in any filament. Initially, the error messages accompanied the flashing red lights but now the AMS2 just sits indefinitely flashing the red lights with no other activity occurring or being recognized by the H2S.

4

You could try to disconnect the AMS and do a factory reset on the printer.
After that switch of the printer and reconnect the AMS again. Make sure all cables are firmly connected.

If that doesn’t resolve anything, I would create a support ticket at Bambu Labs. This is not normal for sure.

2 Likes
5

I appreciate the response Gerrit. I opened a support ticket over 4 days ago, no response at all.

Separately did perform a factory reset on the H2S to no avail unfortunately. 6-pin connections are tight as far I can tell at least. Thanks again for the response.

6

From what I hear, they should respond in approximately 2-3 days.
They are definitely late then.

Not a very good first impression this way.

Success in the follow up!

7

diregard previous i guess , i just read that you suspect it s the ams, but have youtried a different connection cable 6 pin? being that it didnt work on either ams maybe the cable is bad or not plugged in fully?

i dont have ams 2 but if its similar the ams 1 check and make sure all your electrical connectors where they connect to he motors are tight or locked in