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New thermostat..blowing boiler switch fuse

Discussion in 'Electrics UK' started by TheEsoo, 17 Mar 2021.

  1. TheEsoo

    TheEsoo

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    As per title, having had a new thermostat fitted, whenever the heating goes to run, pop goes the fuse.

    Any ideas? Picture attached.

    Apparently it's a three wire installation.. but there's four
     

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  3. EFLImpudence

    EFLImpudence

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    Well,
    3 is Switched Live and
    2 is Neutral

    So it appears that they are the wrong way round - assuming whoever did it hasn't done the same at the other end - but then it wouldn't trip.
     
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  4. TheEsoo

    TheEsoo

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    Thanks, switching them round should sort it?

    Here's the instructions btw
     

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  5. CBW

    CBW

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    assuming they have used blue as Neutral?

    Op - what boiler is it?
     
  6. TheEsoo

    TheEsoo

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    Gloworm ultracom 15?
     
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  7. CBW

    CBW

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    Just making sure it’s not the boiler pump.
     
  8. TheEsoo

    TheEsoo

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    All working now, much appreciated
     
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