Vaillant Ecotec PCB replacement

Discussion in 'Plumbers' Talk' started by Gregory Ridout, Apr 15, 2019.

  1. Gregory Ridout

    Gregory Ridout New Member

    First post so fingers crossed.
    I have just changed the PCB on this boiler, all went smoothly and the hot water is working fine but the heating side seems dead. Have checked and double checked wiring, even tried removing thermostat and replacing jumper but nothing works. Any ideas?

  2. Mike83

    Mike83 Well-Known Member

    Is the heating potentiometer in the correct orientation?
  3. Gregory Ridout

    Gregory Ridout New Member

    Thank you will double check. To be honest had to google potentiometer. Know I didn’t remove during PCB installation.
  4. Mike83

    Mike83 Well-Known Member

    The control knobs for the heating and hot water should usually be turned to minimum before removing the old pcb. This will ensure they line up on the new pcb as they’re already set at minimum.
    If the heating control knob (attaches to potentiometer) is set at minimum on some boilers it basically keeps the heating off.
  5. Gregory Ridout

    Gregory Ridout New Member

    Well Mike
    What can I say, all sorted and a good lesson learnt. Thank you so much!


    Happy Easter

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