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Honeywell HCW80 / HC60NG: heating never stops

Discussion in 'Plumbing and Central Heating' started by idefix, 10 Dec 2017.

  1. idefix

    idefix

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    Location:
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    Country:
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    (Part of) my central heating is controlled by the wireless thermostat Honeywell HCW80 and the relay unit HC60NG which triggers the zone valve actuator.
    The two are linked (i have followed the instructions after resetting both to try to solve the problem and all is well).
    When i turn the thermostat to more than 30 or to less than 5 degrees the relay responds with the various lights.
    However, no matter what temparature, the boiler keeps pumping and the heating never stops.
    This is clearly better than the alternative of having no heating at all, but any idea what could be causing the issue? Is i just the thermostat in the HCW80 that is faulty?
    Do I need to change the HCW80, the HV60NG, or maybe both?
    Any advice would be appreciated.
     
  2. picasso

    picasso

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    Zone valve actuator switch probably stuck on.
     
  3. idefix

    idefix

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    Thanks....this one?
    IMG_20171210_124122.jpg
     
  4. picasso

    picasso

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    If that's the one that does your heating then yes.
     
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    DIYnot Local

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