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Worcester Bosch Overheating

Discussion in 'Plumbing and Central Heating' started by djbarb, 8 Nov 2019.

  1. djbarb

    djbarb

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    Location:
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    I have a Worcester Bosch Green Star 34 CDI Classic.

    The boiler is 11 months old. (Still in warranty).

    Recently I have been experiencing some strange things happening with our DHW.

    Every morning when I run a hot tap / shower I just get cold water. When I go to the boiler it displays a very high temperature of 114 and isn't firing. The boiler is located on the first floor and the pipes that run under the first floor under the floor boards bang and make lots of noise.

    If I continue to run the hot tap / shower the boiler will eventually cool down to 50 Deg and then eventually fire. This can take 10-15 mins.

    The water that comes out initially once it has fired will be kettling then returns to normal DHW temperature within 30 seconds.

    The DHW will then continue to run perfectly throughout the day untill the next morning when the same problem occurs. It's almost as if something is happening during the night as the system rests.

    This has all just started like clockwork as soon as we switched on the heating last month.

    I have had a Worcester Bosch engineer out and he identified the problem as a faulty PCB as it controls a variable speed fan (his words). He has replaced the PCB, unfortunately this hasn't fixed the problem.

    I'm not a heating engineer but I am starting to go out of my mind as I can no longer rely on my recent 11 month old investment to have a hot shower before work each morning. The time it takes for the boiler to cool down each morning is getting longer by the day, so maybe getting worse?

    Any help, tips or advice would be greatfuly received.

    D
     
  2. The Novice

    The Novice

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    Not sure about the pcb failing. Any other issues? Do you have the preheat turned on?
     
  3. just pumps

    just pumps

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    It`s under warranty!
     
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  4. ianmcd

    ianmcd

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    just get them back out its free
     
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