Hi all,

my wife and I just bought a house from 1990 with a super cool, but sadly discontinued central heating system called Nokia Tassu Optimi.

Sadly one of the underfloor heating thermostat‘s is broken. The adjusting wheel has snapped of the back and does not reach into the potentiometer anymore. I can still adjust it with a screwdriver, but I would love to replace the wheel so it is fully functioning again.

I tried tori and ebay but nothing comes up for tassu optimi. Does anybody have any idea (maybe a small electronics shop?) where I could continue my search?

Any help is deeply appreciated!

by TrueMK12344

8 comments

  1. That knob looks reasonably easy to 3d print if it’s a route you’d take. Plenty of 3d companies can do it for you I think. Hope you find a solution anyhow!

  2. I can try printing it for small price 20-30€. And no need to pay until it works. It is also possible that there maybe hobbyist who can do it free. If you are interested we can discuss more.

  3. I would just glue something to make the connection to potentiometer

  4. I’ve never heard before that Nokia made anything temperature/heating related. Cool!

  5. The good news is that the circuit diagram looks like standard potentiometer based thermostat.

    So an electrician should be able to find a replacement if you want to replace the whole unit some day.
    But for now 3D printing is your best bet.

  6. Most straightforward would be to just replace it with a new thermostat.

  8. If you are in Tampere, just drop it to me and I will fix it for free.

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