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Vokera Linea 24... Radiators getting hot when DHW is in use

Discussion in 'Plumbing and Central Heating' started by spannor, 18 Jan 2012.

  1. spannor

    spannor

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    Hi All,
    I have had this Problem for a while now My Radiators getting hot when DHW is demanded and the DHW runs luke warm , i guess thats because its heating the radiators so not heating the DHW properly.

    I recently replaced my pressure switch due to it having a bit of a drip, and in the vokera service kit was all the bits to overall the diverter pin and diaphrams . so i thought i will do them all together.

    When i removed the motorised switch from the diverter block i noticed that the pin that operates the diverter was siezed solid. so i stripped it down and replaced all the bit and rebuilt it all seemed fine.

    But it wasn't as the radiators are still heating up when DHW is in use.

    what else could it be the motorized switch seems to operate ok.

    Any help would be appriciated

    could i have built the diverter block up wrong .. seemed simple enough to do.

    motherboard was replaced 2 years ago
     
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  3. Agile

    Agile

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    It would usually be a faulty diverter valve. I dont know if you did it correctly.

    But there is a non return valve on the output of the primary of the plate HE.

    If this is jammed then the resulting increased back pressure can encourage the diverter valve to leak.

    Tony
     
  4. DP

    DP

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    OK, that is education
     
  5. nickso

    nickso

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    Nope.

    The NRV is on the inlet side of the DHW H/E. If it jams completely shut it will force the bypass open. Find it pretty unlikely the diverter will get forced open if the seal on the bobbin is good and the brass seat has been cleaned properly. If the diverter pin and front seal are in poor condition it will stick of course.
     
  6. spannor

    spannor

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    Hi again,
    Thanks for the replys,
    i am gonna strip it all down again and clean it all.
    gonna clean the DHW H/E and check all valves ... i have had loads of problems with the system being full of magnatite.

    will get back when i have done the clean out

    Thanks guys
     
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  8. dangas123

    dangas123

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    when calling for c/h is the dhw h/e getting hot. the valve itself might not be moving over correctly
     
  9. DP

    DP

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    Issue is rads heating up when HW is demanded, not what is suggested above. Anyhow, HWHE will heat up during CH demand, not enough to supply HW but heat up it will just like flow pipe will heat up under the boiler during HW demand
     
  10. dangas123

    dangas123

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    the hwhe during c/h operation heating up suggests that the diverter valve is not moving over fully and needs replacing. its letting by not allowing enough hot water through to heat the dhw while there is a demand
     
  11. spannor

    spannor

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    Hi All

    Off to get a new diverter valve kit to overhaul it again and double check it all again .

    Thanks guys .
     
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