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Discuss Honeywell Valve Not Working in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. G M

    G M Member

    Hey folks,

    I have a Nest thermostat which I would like to use the hot water function. The problem I am having is that when I select hot water, the Honeywell valve won't open. It has never actually worked since the system was installed about 6 months ago. I just left the valve open, but now we are approaching the hotter weather, I would very much like the option to just heat the water on demand rather than the entire house.

    My electrician was out yesterday and did spot a dead cable in the Nest control box. He replaced this cable and tested all the other ones, so I don't think this is an electrical issue. I am leaning towards a DOA Honeywell valve. I was thinking of just buying a replacement motor to see if that worked as it seems an awful lot of hassle to get the whole valve replaced. I will likely have to get the entire system drained and pay a plumber to come out and fix it.
    Before I try a new motor, is there any default setting on the valve, or on the thermostat that I am overlooking? I am using a Warmflow unvented heating system. Thanks all!

    20180417_192206.jpg 20180417_192214.jpg
     
  2. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Which generation nest do you have? 2nd or 3rd? 2nd gen doesn’t support hot water unless the old programmer is left in situ. The 2nd gen only replaces the thermostat.
     
  3. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Also. Did we not instruct you about this before? Sound very familiar.
     
  4. G M

    G M Member

    It's a third gen Nest and it definitely does support hot water. Thanks.
     
  5. G M

    G M Member

    Haha good memory! The last post was that I couldn't get any hot water at all. Opening the valve sorted that. Secondly, my plumber advised at the time to get the wiring checked. I only did that recently because I was in no rush to get the hot water working without the heat. Now that the wiring has been checked and fixed, the valve still won't open.
     
  6. Chalked

    Chalked Plumber GSR

    Need a new plumber and Electritian.
    Both can determine if your problem is electric, or mechanical.
     
  7. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    If the nest is putting power to the valve and the valve isn’t opening then it is a new valve I’m afraid and I know you have disliked the post above but Chalked is right. Either of the 2 professionals you have had in so far should have been able to test what the faulty component was. He wasn’t being mean. Just trying to save you money in the long run.
     
    • Like Like x 1
  8. G M

    G M Member

    Thanks. I've ordered a new valve anyway.

    I've removed my 'disagree' vote. I've known my electrician for years and I've no reason to doubt his competency. The plumber was just a rushed job which I'm disappointed with, so he's maybe half right.

    I'll let you know how the new valve turns out. Thanks!
     
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  9. heatservice

    heatservice Member

    Sorry but did no one check if there was power going to the valve motor itself with their multimeter ?
     
    • Winner Winner x 1
  10. G M

    G M Member

    Yeah they did. I checked with my electrician today. I just thought of something. When I switch the hot water on, should the oil boiler not ignite at least? It isn't doing anything. The oil boiler only comes on if I switch the heat on. This is all very confusing. Thanks for the help!
     
  11. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Nope
     
    • Like Like x 1
  12. heatservice

    heatservice Member

    The boiler will only fire when at least one of your valves drive open and trigger the microswitch it looks like your HW valve is not doing that.
     
    • Like Like x 1
  13. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Do you have any hot water at all or does it run cold ?
     
  14. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    He said it only gets hot when the lever is held in the open position mate.
     
    • Like Like x 1
    • Agree Agree x 1
  15. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Might be the valve could be how it's wired to the unvented cylinder
     
    • Agree Agree x 1
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