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UM3 led colors not working properly after firmware upgrade

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Two days ago I initiated a firmware upgrade via the menu on my UM3, and I noticed that the colors off the LED's on the nozzles are no longer RED when the associated extruder is hot, nor are they alternating RED/BLUE when cooling down or heating up.

I only see this when the actual print has started, in the preparation phase the colors are correct (as per the manuals).

Using Cura I checked the temperatures, these are all OK (also for the extruder that is on 'stand-by') without oscillations.

I suspect this is just a coding issue in the firmware that only affects the 'color-coding' logic since the machine itself is all that it is supposed to. I am OK with things being this way, but for others this might be problematic, so I thought it would be best to just report it so that UM can fix this.

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Are you sure you installed the "stable version"? and not the test version ?


Did the upgrade using the menu on UM3's screen itself, so I am assuming it will only get stable versions.... I will check firmware version once current print is ready and update this post with the version currently on the machine. I remember that '20161104' was part of the version, so I am assuming this version was released Nov. 4th?

Edited by Guest

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