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DHW temp fluctuation with viessmann vitodens 100 combi

Discussion in 'Plumbing and Central Heating' started by dawson6777, 8 Nov 2011.

  1. dawson6777

    dawson6777

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    Hi, I have a viessmann vitodens 100 condensing combi boiler. It has been fine until now. The water temp. when in the shower fluctuates, warm, then cold then back warm again. It repeats this until shower is turned off. I have metered the boiler temp sensor, and according to the book at 50 degrees should be around 4 k ohms. which it is.
    Could it be the heat exchanger?

    Dawson
     
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  3. adlplumbing

    adlplumbing

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    it could be catirage in your shower gone
    if the hot tap is fine
     
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