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Oil Boiler Wont Turn Off!

  • 09-06-2021 6:37pm
    #1
    the kelt
    Registered Users Posts: 1,892 ✭✭✭


    Have an oil burner for our central heating, newish build just over 2 years.

    Also have Nest thermostats for upstairs and downstairs.

    Boiler started running and heating upstairs for no reason. Thermostats not on, turned them on and off again with no effect.

    Completely reset the Nest thermostats and no effect, boiler keeps running.

    Eventually had to flip the fuse in the fuse box as the only way of stopping it.

    Anyone have any ideas?


Comments

  • #2
    Lenar3556
    Registered Users, Registered Users 2 Posts: 1,523 ✭✭✭Lenar3556


    the kelt wrote: »
    Have an oil burner for our central heating, newish build just over 2 years.

    Also have Nest thermostats for upstairs and downstairs.

    Boiler started running and heating upstairs for no reason. Thermostats not on, turned them on and off again with no effect.

    Completely reset the Nest thermostats and no effect, boiler keeps running.

    Eventually had to flip the fuse in the fuse box as the only way of stopping it.

    Anyone have any ideas?

    Is it an external boiler? If so there may be a frost stat that is not operating correctly.

    More likely is an issue with a motorised valve stuck open, or maybe something lying against it in the hot press?


  • #3
    corsav6
    Registered Users, Registered Users 2 Posts: 1,597 ✭✭✭corsav6


    the kelt wrote: »
    Have an oil burner for our central heating, newish build just over 2 years.

    Also have Nest thermostats for upstairs and downstairs.

    Boiler started running and heating upstairs for no reason. Thermostats not on, turned them on and off again with no effect.

    Completely reset the Nest thermostats and no effect, boiler keeps running.

    Eventually had to flip the fuse in the fuse box as the only way of stopping it.

    Anyone have any ideas?

    Had the same issue and turned out to be a frost stat, if I remember the name correctly. It turns the heating on if it detects freezing temps to avoid freezing pipes.

    It may be related to your Nest setup or something else but may be something to check.


  • #4
    the kelt
    Registered Users Posts: 1,892 ✭✭✭the kelt


    corsav6 wrote: »
    Had the same issue and turned out to be a frost stat, if I remember the name correctly. It turns the heating on if it detects freezing temps to avoid freezing pipes.

    It may be related to your Nest setup or something else but may be something to check.

    So its with the Nest?

    Sincerely hope its nothing to do with frost in June!


  • #5
    the kelt
    Registered Users Posts: 1,892 ✭✭✭the kelt


    Lenar3556 wrote: »
    Is it an external boiler? If so there may be a frost stat that is not operating correctly.

    More likely is an issue with a motorised valve stuck open, or maybe something lying against it in the hot press?

    Yep external boiler, we dont actually have a hot press.


  • #6
    Darc19
    Registered Users, Registered Users 2 Posts: 3,817 ✭✭✭Darc19


    Has it been serviced?

    If not, get it serviced and have this issue checked at the same time.

    The extra efficiency you will get from a €70 service will save you that in 2-3 winter months


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  • #7
    jimf
    Registered Users, Registered Users 2 Posts: 3,960 ✭✭✭jimf


    most likely micro switch sticking on the motorised valve


  • #8
    tDw6u1bj
    Registered Users, Registered Users 2 Posts: 207 ✭✭tDw6u1bj


    Is this your first summer having the Nest?
    Was the nest powered off and have the batter run down?
    Does the nest thermostats have their own power source?
    What happens when you try to turn it on/off on the nest heatlink ( the white box/base unit)

    I'm asking because I have one and any time it gets plugged out for a bit and the battery runs down it loses its mind and won't work properly for at least 24hrs after it's plugged back in. During that time it will be stuck either always on or always off.

    Apparently a lot of people have had problems with them because they installed them in place of their old thermostats causing them to only have a power supply when heating was called. Often OK during winter when they get a power top up every few hours but causes problems when summer hits and their batteries run down.


  • #9
    DGOBS
    Hosted Moderators Posts: 3,496 ✭✭✭DGOBS


    Boiler started running and heating upstairs for no reason. Thermostats not on, turned them on and off again with no effect.

    Sounds like the upstairs motorised valve issue.
    The extra efficiency you will get from a €70 service will save you that in 2-3 winter months
    very very cheap, nozzles, flexi oil lines, full strip and clean of boiler and burner, oil filters, tank check for water/sludge.....€70!! incl vat
    good service 1-1.5hrs, properly set up and insured, no way to make money at that cost


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