Chosen Solution
The scales stopped working by just showing 0000 or max limit weight figures when pressing the lid down. A few days later the scales seem to have recovered its sensitiveness yet it appears to be too sensitive and readings show changes even when untouched. Is it at all worth attempting to repair it or send it to be repaired?
Facing the 0000/max scale issue, after some reading I decided to look into our TM5. I found somehow strange that some people fixed it “cleaning contacts” or just “disassembbling and re-assembling”. I’ve worked before with load cells, and they are “solid” devices, with soldered and glued connections in the cell end (no contacts to clean there). So I looked at the mainboard end of the load cells wires, at the right back side of the board. While checking the connectors, I noticed that the wires from the three load cells (three groups of four wires each) run quite near the board components, even touching the board, and had ferrite beads around them to reduce electronic noise. Load cells produce quite small voltage signals, so they are very sensitive to noise from board components. So I just pushed wires and beads some milimeters away from the board, checking they kept there after reassembling. Now the scale works fine (I’m too lazy for further testing, maybe connecting an oscilloscope probe to load cells output while moving cables would confirm or discard this theory). Hope this helps.
Hi, If it is still covered by the manufacturer’s warranty, I suggest that you get it repaired by them. If it is no longer under warranty, here’s a link to the ifixit Thermomix TM5 Repair guide which may be of some help in opening the device to ascertain what the problem may be. This link may also be of interest. It seems that you are not alone in having problems with the scales in this device.
Dissasembly Thermomix. Unscrew the 3 screws from the weight sensors. Set the sensors correctly and tighten the screws. The scale will work properly.
Also had the same fault with the scales not working. Disassembled unit removed the sensor feet, contact cleaned all parts and re assembled. All working ok now. Super happy
