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    Which cable to connect heating pump to Ecotec PCB

    Hi everyone, I moved into a house where the boiler had been wired up wrong. I have an Vaillant Ecotec 424. The external pump is not wired directly to the PCB. This means that when the boiler activates by itself (eg anti-frost mode) it is unable to activate the pump, which leads to overheating...
  2. O

    F.83 error specifically when boiler turns on by itself

    Hi, We have a Vaillant ecoTEC boiler 424 (open vented). When we turn on the heating or hot water, it works perfectly. It can run for hours with no problem. However, every now and then (seems to happen at least one per day) the boiler tries to turn on by itself (anti-seize maybe?). When it...
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