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Hot Water & CH mix up?

Discussion in 'Plumbing and Central Heating' started by Crakkers, 17 Nov 2019.

  1. Crakkers

    Crakkers

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    Location:
    Lancashire
    Country:
    United Kingdom
    Can anyone shed any light on the following?

    Hardware: Eco tech 624 - System Boiler NOT combi with a pressurised HW tank.


    What appears to be happening is;

    When I have my boiler set to heat water only, it does so and appears to do so to the set temperature. I've messed about with the tank thermostat and the boiler cuts out at the right temperature.

    When I have the CH on, it also appears to be heating the hot water, but to a much higher temperature and the tank thermostat has no input / effect.

    Any ideas??

    Thanks in advance,

    C
     
  2. terryplumb

    terryplumb

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    Motorised valve sticking / not working properly.
     
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  4. Crakkers

    Crakkers

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    Location:
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    Thanks for quick reply.

    How do i diagnose / test this? I have all the covers off the pipe work at the moment and can see the two motorised valves.
     
  5. terryplumb

    terryplumb

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    On an unvented cylinder ,the motorised valves form part of the safety mechanisms . you should call in a G3 certificated engineer to check it all out.
    Do not be tempted to work on any of it yourself.
     
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