Idiot (me) cuts power cable to thermostat - help needed!

Discussion in 'Plumbing and Central Heating' started by fecklesscraig, 7 Dec 2011.

  1. fecklesscraig

    fecklesscraig

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    In an act of comedy genius, I managed to cut the live feed to our central heating thermostat. As well as a worrying bang, it unsurprisingly knocked out the heating. I reconnected the wires (there were four - three insulated and a strand of bare copper) with a junction box and the heating came back on again. Hurrah! I briefly thought.
    Now, the heating comes on but the thermostat never switches it off, which leaves me with a handful of questions:
    >Have I somehow knackered the thermostat itself?
    >Does it need to be re-calibrated?
    >Could I have damaged the electric controls on the boiler?

    From what I can see. The thermostat in the hall (the one I killed) controls the temperature, but all the timing etc, is done by the control pad underneath the boiler. The thermostat is an old Honeywell thing which I reckon must be at least 25 years old.

    Any advice gratefully received
     
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  3. D_Hailsham

    D_Hailsham

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    Your attempt at self-electrocution may have welded the contacts of the thermostat together.

    Not possible with that type of sat

    Only a test will confirm/deny that.

    Disconnect the thermostat and see if the boiler still works. If it doesn't you know that the stat is faulty.
     
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  4. fecklesscraig

    fecklesscraig

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    Thanks for that.
    Assuming it's the thermostat that's gone, does it seem reasonable to replace the knackered one with a new wireless room one so we can move it about?
     
  5. D_Hailsham

    D_Hailsham

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    Wireless thermostats are not intended to be moved around. They were introduced to make installation easier - no wiring necessary to the control unit.
     
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  6. fecklesscraig

    fecklesscraig

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    Thanks.
    Does that mean that these are my two easiest solutions?
    > Replacing the old static thermostat like-for-like in the same position (i.e to save messing about with the wiring)
    > Finding where the old wiring feeds into the boiler and addding the necessary bits and bobs for the wireless control there.
     
  7. dhutch

    dhutch

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    Sounds fair to me. Although assuming you where happy with its location,a s you have the wire in place (all be it with a join) why go wireless?


    Daniel
     
  8. fecklesscraig

    fecklesscraig

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    Hi Daniel,

    At risk of tempting fate, that's it all fixed now.

    Thanks for your help.

    Craig
     
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