Help - Shower tripping LCD

Discussion in 'Electricians' Talk' started by Mentalmac89, Feb 10, 2021.

  1. Mentalmac89

    Mentalmac89 New Member

    Hi All,
    We just moved into a new house, after spending so much time shifting boxes was looking forward to a nice shower....
    tested it briefly and it worked... and got warm etc... came back later - and nope, nothing.
    The RCD switch had gone to OFF.
    It wouldn’t reset just flip back off instantly.
    I then checked the isolator switch in loft, which is a 3amp fused switch. Check all terminals tight and same in the shower.
    - I then turned switch off in loft and then the RCD back to on. It stayed on.
    - I turned the isolator switch back on in loft and then checked and the RCD switch was still on.
    - I then turned the shower on and it worked again... after 10 mins I turned it off and then turned it back on and it had flipped the RCD again.

    here’s some images...

    Obviously I need to get a proper sparky in and shouldn’t meddle etc... However in the interim, can anyone suggest anything glaringly obviously wrong? Shall I order a new shower? Change the 2.5mm cable to 6mm cabling from the switch in the interim to speed up the process?
  2. terrymac

    terrymac Screwfix Select

    You have a fault ,most likely within the shower unit.
  3. Bazza

    Bazza Screwfix Select

    3amp fused switch? that's just a shower pump! You can see the hot and cold water feed in, it isnt heating the water, so there is no point in changing the cabling!

    Just remove the mains input to the pump (terminal block top right) and see if fault disappears. If it does then its new shower time.
    Mentalmac89 likes this.
  4. terrymac

    terrymac Screwfix Select

    Lots of carbon deposits ,black dust ,visible around the pump motor . The RCD trips if a very small current escapes to earth . The cable size is nothing to do with your problem.
    Mentalmac89 likes this.
  5. Mentalmac89

    Mentalmac89 New Member

    Thanks for the reply - understood on the 3amp switch in loft, just wanted to let you all know the full situation :).
    Likely a new shower time then I guess - doh!
  6. Mentalmac89

    Mentalmac89 New Member

    Thanks, looks like new shower time then?
  7. terrymac

    terrymac Screwfix Select

    Looks like it !
  8. FlyByNight

    FlyByNight Screwfix Select

    I guess that is a wall mounted pump on the shower wall, before you change it out have you considered moving to an independent pump? If you have access to the pipe work, install a pump and feed that to a bathroom mixer. It will be a much better option than what you have.
  9. The Happy Builder

    The Happy Builder Screwfix Select

    Was there any hot water in the storage cylinder?

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