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Thermomix TM5 - jumping values when setting time / temperature / revolutions

broo 38517 13
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  • #1 17137089
    broo
    Level 10  
    Posts: 24
    Rate: 1
    Hello,

    Thermomix TM5.

    I have a problem with "jumping" values when setting the time, temperature or revolutions.
    Writing graphically:
    I have set the time e.g. 00:10, gently turning the knob should set the value 00:11, meanwhile it jumps to e.g. 00:45, the next turn sets the value e.g. to 01:24 and the next e.g. to 00:15 or 03:43 (there is no regularity, once it jumps down once and up).
    It is the same with temperature and rpm setting.

    Has anyone had a similar problem? What was the reason?

    greetings
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  • #2 17137152
    chyczak
    Level 14  
    Posts: 73
    Help: 6
    Rate: 23
    Hello. Undress and lubricate the potentiometer. Unfortunately I did it.
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  • #3 17137437
    broo
    Level 10  
    Posts: 24
    Rate: 1
    Hello,

    Should I underestimate something in particular when disassembling TM?
    Alternatively, can a colleague comment on this video, does he present the correct course of action?


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  • #4 18485902
    macie11111
    Level 1  
    Posts: 1
    Rate: 9
    Hey,
    To lubricate the potentiometer you have to completely disassemble the TM5? What is the best lubrication enough for wd40?
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  • #5 18516253
    ducker1
    Level 26  
    Posts: 855
    Help: 69
    Rate: 83
    Colleagues, are you sure there is a potentiometer instead of an encoder?
    WD40 I advise against electronics.
  • #6 18634839
    asura.kk
    Level 15  
    Posts: 189
    Help: 6
    Rate: 34
    the swab in the film undresses it to a measure properly, screwdriver - torx 5 (I think). The dial is quite an unusual encoder. Absolutely NOT WD40 !! I usually use a thermoplastic preparation for contacts and potentiometers - contact pr ... you want pictures of this part (I recently repaired termomix 5)
  • #7 18976062
    Agnieszkaszczep
    Level 2  
    Posts: 3
    Rate: 12
    Hello. I have a similar problem, the knob goes crazy .... I can ask for some tips ;)
  • #8 18976436
    Dariusz23a
    Level 14  
    Posts: 71
    Help: 7
    Rate: 51
    Hello.
    Disassemble the front cover, note the short wires from the "encoder".
    Disassemble the knob (lift it gently!), Under the knob the white ring (it has 2 latches) which you need to unlock and move the white ring to the left. You can then easily get to the entire "encoder". Disassemble 2 plugs and continue working with the "encoder" , clean etc. Thermomix TM5 - jumping values when setting time / temperature / revolutions Thermomix TM5 - jumping values when setting time / temperature / revolutions
  • #10 21246849
    nickwilson2166
    Level 2  
    Posts: 3
    Hi I need help with thermomix TM5 rewiring circuit board back up, theirs 3x 5 pin connectors that look the same, which connect to board labeled cn350 cn360 cn370, and the cables aren't labeled
  • #12 21249698
    nickwilson2166
    Level 2  
    Posts: 3
    Hi just checking that we're talking about the same connections here a photo Close-up of a printed circuit board in an electronic device with colored wires connected to connectors.
  • #13 21249752
    mipix
    Level 38  
    Posts: 4050
    Help: 489
    Rate: 1458
    Yes, these are the connections. The wires are terminated with strain gauge beams in the feet of the device. It does not matter where which one is connected. Calibration takes place each time the scale is tared.
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Topic summary

✨ The discussion revolves around a malfunction in the Thermomix TM5, where users experience "jumping" values when adjusting time, temperature, or revolutions. Suggested solutions include disassembling the device to access and lubricate the potentiometer or encoder, with warnings against using WD40 for electronics. Users share detailed instructions for disassembly and cleaning, emphasizing the importance of using appropriate lubricants for electronic components. Additional inquiries about wiring and connections on the circuit board are also addressed, confirming that the connections are interchangeable and calibration occurs during use.
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FAQ

TL;DR: TM5’s jumpy knob points to a dirty encoder; "Disassemble 2 plugs and continue working with the 'encoder'." Two latches under the knob give access; clean contacts to restore smooth steps. [Elektroda, Dariusz23a, post #18976436]

Why it matters: This helps TM5 owners and DIY repairers quickly fix erratic time/temperature/RPM selection without costly service.

Quick Facts

Why does my Thermomix TM5 knob jump values when I turn it?

The dial uses a mechanical encoder whose contacts need cleaning. A member notes it is an unusual encoder, not a potentiometer. Clean the encoder with proper electronics contact cleaner. Avoid WD‑40 on the electronics. This typically restores smooth, predictable steps. [Elektroda, asura.kk, post #18634839]

Is the TM5 dial a potentiometer or an encoder?

It is an encoder, not a potentiometer. That matters for troubleshooting and chemicals. "The dial is quite an unusual encoder." Use contact cleaner rather than lubricant on the contacts. [Elektroda, asura.kk, post #18634839]

How do I access and clean the TM5 encoder?

Follow this 3‑step process:
  1. Lift off the knob gently. Unlock the white ring’s two latches and slide it left.
  2. Note the short wires. Disconnect the two encoder plugs before handling the module.
  3. Clean contacts with electronics contact cleaner. Reconnect, re‑seat the ring, and test. [Elektroda, Dariusz23a, post #18976436]

Should I use WD‑40 on the encoder?

No. "Absolutely NOT WD40 !!" Use a cleaner formulated for electronic contacts instead. WD‑40 is not intended for precision encoder contacts. A contact product like Kontakt PR is recommended by repairers. [Elektroda, asura.kk, post #18634839]

Which cleaner should I use to stop the jumpy values?

Use an electronics contact cleaner. One repairer recommends a thermoplastic preparation for contacts, such as Kontakt PR. Apply sparingly to the encoder, rotate the shaft, and allow it to evaporate. Reassemble and test for stable increments. [Elektroda, asura.kk, post #18634839]

Do I need to fully strip the TM5 to reach the knob encoder?

No. Remove the front cover, then the knob and white ring to access the encoder. Watch the short encoder wires. Disconnect its two plugs before cleaning or reseating the module. [Elektroda, Dariusz23a, post #18976436]

How do I remove the TM5 knob without breaking anything?

Lift the knob gently. Under it, unlock the white ring’s two latches and slide the ring left. This exposes the encoder and its plugs while reducing strain on the short wires. [Elektroda, Dariusz23a, post #18976436]

Is WD‑40 safe for TM5 electronics?

Avoid it. As one contributor put it, "WD40 I advise against electronics." Use a dedicated electronics contact cleaner to avoid residue on signal paths. [Elektroda, ducker1, post #18516253]

How many connectors go to CN350, CN360, and CN370?

Three identical 5‑pin connectors plug into the mainboard at CN350, CN360, and CN370. They look the same and may not be labeled on some units. [Elektroda, nickwilson2166, post #21246849]

Does connector order matter for CN350/CN360/CN370 after reassembly?

No. These are strain‑gauge plugs from the feet. You can connect them in any order. The scale calibrates each time you press tare. [Elektroda, mipix, post #21249752]

Do I need to calibrate the scale after reconnecting those cables?

Manual calibration is not required. The device tars and calibrates the scale on each tare action. This design allows interchangeable strain‑gauge connections. [Elektroda, mipix, post #21249752]

What symptoms point to an encoder issue on the TM5?

Values jump up or down unpredictably despite gentle turns. For example, time can jump from 00:10 to 00:45, then to 01:24. The behavior lacks regularity and also affects temperature and RPM. [Elektroda, broo, post #17137089]

Where can I find a dependable disassembly reference?

Use the iFixit Thermomix TM5 Teardown. It provides a step‑by‑step guide with photos and part locations. Follow the sequence to avoid damage. [Thermomix TM5 Teardown]

Any precautions to avoid damage while working on the encoder?

Mind the short encoder wires when removing the front cover and knob. Do not pull on the harness. Disconnect the two plugs before manipulating the encoder assembly. [Elektroda, Dariusz23a, post #18976436]
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