1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Only shower hot water fluctuates; boiler turns on & off often

Discussion in 'Plumbing and Central Heating' started by DIY_somewhat, 5 Oct 2015.

  1. DIY_somewhat

    DIY_somewhat

    Joined:
    5 Oct 2015
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi All,

    New to the forum; but read through a lot of threads and solutions for possibilities around combi boiler, before posting.

    Bought a flat that has a Ariston MicroGenus (not sure how old). The hot water in the shower (both through shower head and bathtub tap) fluctuates from hot to barely lukewarm every few seconds. When the temp on the boiler hits 80, the flame turns off till the temp goes down to 60, and then turns back again - all within matter of 5-10 secs. But this doesn't happen for the kitchen or bathroom sink, where temp stays at 70 steady.

    Any thoughts? Should I be checking for limescale/sludge? Should I be look at the Main HE or Secondary HE?

    Any advice on how to troubleshoot this would be super helpful.
     
  2. Sponsored Links
  3. Rampage77

    Rampage77

    Joined:
    28 Nov 2014
    Messages:
    332
    Thanks Received:
    80
    Location:
    Earth
    Country:
    United Kingdom
    Chances are it will be the secondary heat exchanger blocked ('normally' is this with your symptoms)
     
  4. DIY_somewhat

    DIY_somewhat

    Joined:
    5 Oct 2015
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Is it normal for it to be a Secondary HE scaling issue when it's only affecting the shower and not the rest of the taps?? On the shower, this occurs when only the hot water tap is open, so it's not a case of cold water mixing in. Thanks.
     
  5. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Sponsored Links
Loading...

Share This Page