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Hortsmann heat contol replacement

  • 18-04-2024 10:35am
    #1
    coolaboola1357
    Registered Users, Registered Users 2 Posts: 38 ✭


    Hi All

    We currently have an H37XL which has been replaced with the H3747. So i removed the old unit and the wiring seems to be the same for the new unit, earth, neutral, live and then a live for zone 1,2 and hot water so i changed nothing on the wiring front

    I installed the new unit and its getting power but the boiler wont come on. I think it may be something to do with the wired thermostats we have as i set the temp on the wireless PTD to 30 degrees and the boiler still wont come on. We have one wired thermostat on ground floor and one upstairs

    Anything i can try here before calling an electrician ? I think its only something small that im missing



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