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Heating coming on at random times, when timer is off

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  • 24-01-2020 10:13pm
    #1
    Sofiztikated
    Registered Users Posts: 6,995 ✭✭✭


    I've a weird one.

    Oil central heating comes on at random times, even though the clock is set to OFF. I've went through and turned any set times to off, but still randomly coming on.

    I'm not complaining that the house is warm, but if it's burning oil when I'm not there, then it's a bit daft.


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    #2
    John.G
    Registered Users Posts: 3,468 ✭✭✭John.G


    If your house is zoned then its more than likely that one of the zone valves is faulty as its this (these) that give the run signal to the boiler.


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    #3
    wiz569
    Registered Users Posts: 1,696 ✭✭✭wiz569


    John.G wrote: »
    If your house is zoned then its more than likely that one of the zone valves is faulty as its this (these) that give the run signal to the boiler.

    But doesn't the clock/programmer need to send a live signal to the zone valve first?


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    #4
    John.G
    Registered Users Posts: 3,468 ✭✭✭John.G


    wiz569 wrote: »
    But doesn't the clock/programmer need to send a live signal to the zone valve first?

    It does but the actuator head often doesn't close the valve when it developes a fault and it's end switch is still made which gives the run signal to the boiler. It's a fairly common fault and sometimes the zone with the faulty actuator will continue to heat. You will generally feel a good spring resistance when manually opening a de enerized zone valve.


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    #5
    CoBo55
    Registered Users Posts: 8,811 ✭✭✭CoBo55


    Frost stat if it's an outdoor boiler.


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