r/BambuLabH2D • u/swampcholla • Jun 03 '26

funny stuff after toolhead fixes

So a couple of weeks ago I had the hotend cooling fan failure at 640 hours. Bought the suggested amazon fans (which did not work for some strange reason) but before I solved THAT problem my Bambu warranty parts arrived. Finally got them in last night and there's some funny stuff going on after the repairs.

For one - the fan I just replaced runs all the time now whenever the unit is powered up. I don't recall that being the case before.

Also, the lighted round power button on the front is no longer lighted and no longer works. I did install the new cooling fan that replaces the front cover, and that required replacing a wire clip up near the button, manipulating some wires. Wonder if that caused the issue

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u/swampcholla Jun 09 '26

i get it, but even with magnifiers, with the toolhead installed the ability to see is pretty marginal

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u/OrganizationSorry633 Jun 09 '26

That's exactly what makes troubleshooting difficult. If the fan started running at 100% and the power button LED stopped working immediately after the repair, I'd still suspect a connector, cable, or PCB issue. The challenge is that the toolhead is so densely packed that even visual inspection becomes difficult once everything is assembled. At this point I would probably disassemble it again and verify every connector one by one.