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    VAILLANT ECOTEC PLUS 831 - hot water sometimes runs cold

    Many thanks Mickyg. I guess I'd better find a good engineer and get the items you suggested checked out!
  2. A

    VAILLANT ECOTEC PLUS 831 - hot water sometimes runs cold

    We have an intermittant fault with our 5/6 year old boiler. The hot water will occasionally run cold after a couple of mins and the boiler shows an S.53 fault code. Turning tap/shower off for a minute or so cures the problem. Water also runs cold if taps turned on high. Engineer came out about 4...
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