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Permanently Open motorised valve after nest installation

  • 04-03-2019 11:09pm
    #1
    t8010789
    Registered Users, Registered Users 2 Posts: 82 ✭✭


    I have had a nest learning thermostat installed upstairs to replace a manual thermostat, since installation a few days ago the Honeywell motorised valve downstairs seems stuck open. Downstairs is wet ufh and when any of the stats downstairs request heat it also sends heat upstairs. Is it possible that when the nest control box was wired into the joule connection box that the motorised valve wires in the connection box have become crossed? The system is less than 6 months old so doubt the valve motor has gone already.


Comments

  • #2
    rightjob!
    Registered Users, Registered Users 2 Posts: 478 ✭✭rightjob!


    t8010789 wrote: »
    I have had a nest learning thermostat installed upstairs to replace a manual thermostat, since installation a few days ago the Honeywell motorised valve downstairs seems stuck open. Downstairs is wet ufh and when any of the stats downstairs request heat it also sends heat upstairs. Is it possible that when the nest control box was wired into the joule connection box that the motorised valve wires in the connection box have become crossed? The system is less than 6 months old so doubt the valve motor has gone already.

    Do you have 3 zones?upstairs/downstairs/hotwater?
    If so and you are using one nest,the nest can control 2 zones,heating and hotwater.
    More than likely the installer has wired both heating circuits into one.

    If you have 3 zones you need 2 nests.


  • #3
    t8010789
    Registered Users, Registered Users 2 Posts: 82 ✭✭t8010789


    Upstairs is one zone, operated by the nest. Downstairs is three zones, each controlled by a wired thermostat. Its a combi boiler so hot water on demand. Regardless of which thermostat you turn up downstairs, heat travels upstairs because the motorised valve is in its open position, I'm almost certain that this problem only occurred since the nest install. As I stated previously, the system is less than six months old, so failure of the valve is unlikely.


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