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Vaillant Ecotec Pro 28 - replaced knob, 0c - no hot water or heating

Discussion in 'Plumbing and Central Heating' started by VarnishMarnish, 23 Oct 2021.

  1. VarnishMarnish

    VarnishMarnish

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    Hi,

    Moved into a flat with a broken knob that controls the radiators. Estate agents were useless so was forced to do a self repair.

    Ordered new knobs and followed this procedure to the letter -



    Once I turned the boiler back on, it just says "0c" and no longer have hot water or heating:

    IMG_20211023_1203553.jpg

    Pressing the i button gives me an S. 0 code "no heat demand":

    IMG_20211023_1204000.jpg


    Need advice on this quickly please!
     
    Last edited: 23 Oct 2021
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  3. wannocks

    wannocks

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    Try twisting your knob. In the picture its set on minimum.
     
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  4. VarnishMarnish

    VarnishMarnish

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    I got a green light now but the temperature doesn't go up and down - stays at 0 unless I turn either of the knobs (then it shows the temp of water / heating temporarily then goes back to 0)
     
  5. picasso

    picasso

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    Got a thermostat somewhere ? and what happens when you turn a tap on and press i on the boiler.
     
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  7. CBW

    CBW

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    Think you may have disturbed a harness, double check everything is plugged in at pcb (turn the power off first).
     
  8. ianmcd

    ianmcd

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    is the heating control know hard to turn ?
     
  9. VarnishMarnish

    VarnishMarnish

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    It was, but just had an engie in and he said the PCB's had it. Says I'm looking at a new boiler since it's pretty old anyway.

    No it turns very well and shows the temps and everything
     
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  10. CBW

    CBW

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    Up to you, a new pcb for that boiler is approx £180 plus fitting. ebay sell reconditioned pcb’s cheap enough, it’s whether you want to take the risk.
     
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