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Worcester 42cdi Hot water problem

Discussion in 'Plumbing and Central Heating' started by Pianogeezer, 28 Aug 2019.

  1. Pianogeezer

    Pianogeezer

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    Hello,
    I have a problem with my Worcester Greenstar 42cdi. It was working fine until yesterday. when I noticed that the hot water would not get hot. upon further investigation, I am even more baffled.
    The boiler is in the upstairs bathroom.
    1. Bathroom sink, (closest to boiler) gives warm water.
    2. Bath, warm water.

    If I run both taps at the same time, the bath tap goes cold, but the sink tap gets hot. I cannot get the bath tap to give out hot water. Also no hot water from the kitchen sink.

    Any help greatly appreciated as wife is frustrated!
     
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  3. Gasguru

    Gasguru

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    Got any mixer taps?
    Try isolating the cold inlet to the boiler and see if you still get water out of any hot taps.
     
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  4. Pianogeezer

    Pianogeezer

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    Ive found the problem!...
    the garden hosepipe is linked to the hot water system, It was fitted a few years ago but never been used. It is connected under the kitchen sink, (hot and cold merge into the one pipe which goes outside to the hosepipe).

    I switched the hot on to fill the swimming pool for the grand daughter and forgot to switch it off afterwards. Obviously, it is not a one way valve as when this valve is open, the cold water is running into the hot water pipe.
    What type of valve should this be?

    Thanks for your help
     
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  5. Alec_t

    Alec_t

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    Deleted.
     
  6. Gasguru

    Gasguru

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    You need double check valves on the hot and cold feeds...
     
  7. jeff the gasman

    jeff the gasman

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    You need a pressure equalising valve or a blending valve
     
  8. AGAS

    AGAS

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    oh bless him :)
     
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