I made a mistake in the last post. The picture represents a similar problem of my friend's UM2. His UM2 sometimes shows the error message as the picture. After turning it off and on several times, the message is gone and the nozzle shows irregular temp on the display. E.g. The screen shows the nozzle temp going up to 220, but it is actually lower than 150. So his printer is still not working as mine.
I should make my situation more clear. The screen shows the message with the "Bed".
I also check the 4 wires extending to the bottom board(heated bed and temp 3). I think they are connected firmly enough.
But I try to unplug and plug again the pin and wire. The screen looks normal, but the irregular buildplate temp remains.
I also try to replace the buildplate and connect the one from my friend's UM2. And it can work regularly. So I guess it may be something wrong with the buildplate board.
The warranty of 2 printers are expired. I suppose we may figure it out by your help. We are in Taiwan.
Wrong temp sensor LTC. If it was the "bed" sensor it would say "bed" in the error message. So it's the nozzle sensor.
How old is your printer? If under warranty create a ticket at support.ultimaker.com.
These sensors are repairable but they usually fail inside the nozzle heater block. And getting them out can be easy sometimes or at other times impossible without damaging them. Start by disconnecting the wires underneath the UM2 and measuring the resistance. It should be 108 ohms at room temperature (20C). Anything from 90 to 120 ohms should be considered normal. What country are you in LTC? Please update your settings "location" to indicate your country. I could guess Australia but better to mention it explicitly.
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