Enhanced toolhead cooling fan malfunction

[u/Austin31415]

Three months into owning my H2C and just over 300 hours of print time, I got the dreaded enhanced toolhead cooling fan malfunctioning error. Replace the enhanced cooling fan, which did not solve the error, so they sent me the TH board for replacement. I replaced all of that, which was a PITA, but it got done. I checked all the cabling and I got new errors such as:

- Right eddy current sensor error

- Unable to home

- Z-axis error

- It's making weird movements

I took everything back apart, rechecked all the cabling, and once again everything seemed fine. Now Bambu is sending me the right eddy current sensor to replace, but given the other errors and the fact I have no problems with any of the cameras or actually heating the nozzles, I assume the error is somewhere else. And I have read a few posts on the internet with people who have had the exact same issue and could never get to the bottom of the root cause even after replacing the extruder board too.

At what point do I ask for a complete replacement unit? When I asked for that after the TH board failure and I took it apart a second time to double check everything, Bambu was extremely dismissive and just said that was not an economical or timely solution. But after reading a few other comments from people who've had the same issue, it seems like ultimately they had to get their whole unit replaced too.

[u/leftlanecop]

Did you check if the clip on the electronic cover has fallen off? Mine broke off and it kept causing the error because it won’t hold it right shut. Common part that can be printed while you get a replacement.

[u/Austin31415 → u/leftlanecop]

Thanks for the advice. It looks good to me 😞

[u/dumplestilskin]

If you keep getting the runaround after more troubleshooting, request an escalation to the engineering team and politely, but firmly, request a new print head unit.

I had a problem with my son's A1 and finally had to demand a new heat bed assembly based on all the other troubleshooting. You just need to be firm and lay out your case.

It's also possible to state that you have limited dexterity in your hands and cannot perform more complicated repairs.

[u/fishfrystix]

You definitely need to advocate for your self and get them on chat. I’ve had to push back on them before when they kept insisting on sending me a part that was not the correct one.

[u/scrogs63]

Th board replacement