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ecotec 428

  1. na51hog

    Sherlock Holmes needed for Dr Watson - ecoTEC plus 428

    Hi, I am trying to understand the root cause of my radiators getting lukewarm at best. I have an ecoTEC plus 428. It doesn’t display any fault codes, but it spends most of its time with the boiler off, displaying a blinking radiator. Seemingly, as a consequence, my radiators never get more...
  2. C

    Vaillant Ecotec Plus 428 with UPS2 Pump

    Do they work together? Part of sorting out the flow in my system was the fitting of a new pump. (The poor power flush filled the old one with iron filings but did cure the boiler noise). So I have a UPS2 which has the 'Variable Speed Mode'. The system is a conventional with loft supply tank and...
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