Heating comes on (& stays on) when hot water turns on

Discussion in 'Plumbing and Central Heating' started by JAM120, 14 Oct 2020.

  1. JAM120

    JAM120

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    Hi

    I have a new problem since the weekend where my heating comes on when my hot water turns on and then continues to heat irrespective of the thermostat set temperature. For example my (Nest) thermostat is set to 21, the nest is telling me that the inside temperature is higher than that e.g 23, but the rads remain hot and continue to heat. If I switch off the hot water the boiler sets to idle and only then do the rads start to cool.

    From some rudimentary testing the 3 port valve seems to always be in the ‘Auto’ position.

    Perhaps coincidentally I am having some work done in my bathroom, but the fitter tells me that the problem is likely to be with the Nest, rather than any effect of the work he is doing.

    Any thoughts/suggestions gratefully received.
     
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  3. Mottie

    Mottie

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    Does the hot water heat up when the heating is on even if the hot water is switched off?
     
  4. JAM120

    JAM120

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    Honestly....I don’t know the answer to that. The Nest will turn the heating on at any point in the day if the inside temperature falls below x, so difficult to know if the hot water also heats at the same time.
     
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