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Timer off but boiler still running

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  • 16-03-2021 11:53am
    #1
    CountingCrows
    Registered Users Posts: 1,830 ✭✭✭


    I have a Vokera 25S gas boiler. It has started to run constantly when the timer is off. I'm getting Vokera to service the boiler next week but they seem to think the boiler isn't the issue.

    Here is a picture of one of the zone valve. I have 3 zones - upstairs, downstairs and water. The light on the valves go on/off in sync with the wired timer's settings. Is there anyway to troubleshoot this further?


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    #2
    Wearb
    Moderators, Home & Garden Moderators Posts: 6,240 Mod ✭✭✭✭Wearb


    Those look as if they can be unplugged? If they can, unplug and replug each one in turn to see which turns off the boiler.

    Please follow site and charter rules. "Resistance is futile"



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    #3
    CountingCrows
    Registered Users Posts: 1,830 ✭✭✭CountingCrows


    Wearb wrote: »
    Those look as if they can be unplugged? If they can, unplug and replug each one in turn to see which turns off the boiler.

    Thank you. The upstairs value is causing the problem. I pushed the spring and its working correctly again but I presume this will be temporary. Is this a job for a plumber or an electrician?


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    #4
    Wearb
    Moderators, Home & Garden Moderators Posts: 6,240 Mod ✭✭✭✭Wearb


    CountingCrows wrote: »
    Thank you. The upstairs value is causing the problem. Is this a job for a plumber or an electrician?
    Either, or even a knowledgable handyman. It's not a difficult job.


    Most likely that head just need changing. The valve that it operates is most likely alright.

    Please follow site and charter rules. "Resistance is futile"



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    #5
    punisher5112
    Registered Users Posts: 24,647 ✭✭✭✭punisher5112


    Get a replacement, like for like and just pop on.


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    #6
    CountingCrows
    Registered Users Posts: 1,830 ✭✭✭CountingCrows


    punisher5112 wrote: »
    Get a replacement, like for like and just pop on.

    Hmm, it's in an awkward place behind the water tank and won't the system need to be drained and refilled etc?


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    #7
    jimf
    Registered Users Posts: 3,953 ✭✭✭jimf


    CountingCrows wrote: »
    Hmm, it's in an awkward place behind the water tank and won't the system need to be drained and refilled etc?

    no as your only changing the actuator not the valve itself

    no water involved


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    #8
    punisher5112
    Registered Users Posts: 24,647 ✭✭✭✭punisher5112


    CountingCrows wrote: »
    Hmm, it's in an awkward place behind the water tank and won't the system need to be drained and refilled etc?

    It's on top of the pipe, the water doesn't go through the unit, it only opens and closes the valve.

    They twist off, pop back on....


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    #9
    youtheman
    Registered Users Posts: 1,275 ✭✭✭youtheman


    Those systems are normally wired such that all your zone valve limit switches are wired in parallel, i.e. any one valve indicating open causes your boiler to fire. So if any of your limit switches are stuck in the 'closed' position (indicating valve is open) then the boiler will run continuously. So you'll have to disconnect each actuator wiring to find out if indeed one switch is stuck in the closed position. The valve can be opening and closing correctly but the switch can be stuck in one position.


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