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Helpppp! Ultimaker Original not reading temperatures correctly

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Posted · Helpppp! Ultimaker Original not reading temperatures correctly

I own the Ultimaker Original HBK, however, I am facing a couple of difficulties with it, which I am hoping perhaps someone could help with?

The first is that the thermoster readings are way off on both the Heatbed and the Extruder heat. Even at rest the best I can get is 40 degrees for the HB and 59 degrees for the extruder. For both of the readings; I have tried the Ultimaker Firmware builder and a Marlin build with a new board and Arduino Mega 2560 and all combinations of the thermostats and thermoster, and unfortunately the 59 degree reading on the hotend came through setting the “10K (not recommended for hotend) thermoster!”

In addition to that problem, comes the second one.

The HB is heating up nicely! So is the Hotend, however, at the business end of the LCD (I am now using a new Smart controller as I initially thought there might have been an issue with the LCD) the temperature goes backwards:-  59, 57, 53, 49, 33 etc, you get the picture, until it alarms out at a MIN TEMP ERROR!  I’ve looked at reversing the wires, however this hasn’t helped.

I at a loss, please can you help?

Kindly asking for some kind of advice

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Posted · Helpppp! Ultimaker Original not reading temperatures correctly

reversing the wires.  lol.


I have a UMO with the HBK.  Does your UMO have the white circuit board?  Or the green one?  This makes a big difference.


Does your print head have a little tiny circuit board on top?


Did the HBK ever work?  Or did things go south the moment you upgraded?


You could try uploading the old firmware to make sure the head still works.  Please answer the questions and if you have the green circuit board with the add on HBK board please photograph the add on board.


Which firmware builder are you using?  This one?



Typically the head uses a thermocouple "AD595" and the bed with the official HBK uses a PT100.  It's important if you have the green board that you remove any 4.7K resistor you may have added - if you have the green pcb please also take a photo of the area where the bed temp sensor plugs in (that shows the nearby components).

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Posted · Helpppp! Ultimaker Original not reading temperatures correctly

Hi gr5,

Thanks for getting back to me.

It had the green board, however it blew up! Well a resistor did when we first turned it on, so we retired it as per the instructions on the downloaded manual. It now has a generic board from AliExpress, which is labelled Ulimaker,com which the same connections as the green board and a new Arduino and stepper drivers, carefully placed in the correct direction. 


The print head does have the tiny circuit board on top, yes.


The HBK does work and heats, it’s current temperature reading is 40c, although I am currently setting it at “PT100 as per Ultimaker V.2” from memory! (Sorry if I mislead you on this)


The head heats, but upon heating the temperature readings go backwards on the LCD and when it hits the minimum temperature I get the MIN TEMP ERROR and it stops heating. At this point though, the heat of the head is significant.


Yes, I’ve used the Bultmaker.bulles.eu firmware builder, but also built a custom Marlin/Arduino firmware as well to try and solve the issues. 


I’ll add the photo in a bit, although I haven’t added any extra resistors, so I dont think there’ll be any extra AD595’s on the board. Hope this helps as a start?

Thanks again



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