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

Worcester Combi Junior 24i Kettling CH

Discussion in 'Plumbing and Central Heating' started by fin88, 30 Nov 2019.

  1. fin88

    fin88

    Joined:
    30 Nov 2019
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi there,

    I have a 10-15 year old Worcester Combi Junior 24i that kettles only on Central Heating cold start. This winter is the first time it's started doing it. When it kettles, if I turn off the boiler via the thermostat for a few minutes then turn it back on again it runs no problem until the system cools down.

    When running CH all radiators get hot. Pump appears to be working fine. I bled the pump and checker the impeller was running freely with a screw driver.

    I've been the owner of the flat in which the boiler lives for 5 years.

    Last week I added Fernox F3 to the system and left it in for 7 days on regular heat cycle. The severity of the kettling noticeably improved but after a week it still remained.
    I then flushed the whole system 3 times. Quite a bit of dirty water came out (to be expected as not sure when it was last cleaned).
    I then added Fernox F1 Inhibitor and Fernox F2 Boiler silencer to the CH system as a final prayer.

    It seems like the system is running much more efficiently and is generally much quieter sounding.

    But, the kettling remains, albeit a bit quieter. Now either the kettling stops after a few minutes of it's own accord - seems as if the boiler can get rid of the heat eventually.
    Or again if I turn the boiler off for a minute then turn it on again it runs perfectly for the rest of the time that the CH heating is on.

    It seems like as long as the water in the CH system is above a certain temp then there are no problems.

    Does anyone have any ideas as to what could be causing this problem?

    New boiler is last resort as it appears our kitchen was built around the current boiler, which means we would need a new kitchen as well....

    Thank you in advance!
     
  2. Sponsored Links
  3. plastic_peanut

    plastic_peanut

    Joined:
    2 Apr 2006
    Messages:
    463
    Thanks Received:
    60
    Location:
    Manchester
    Country:
    United Kingdom
    How and where are you injecting the boiler silencer?
     
  4. fin88

    fin88

    Joined:
    30 Nov 2019
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Drained the system then poured it into the radiator nearest the boiler. Then refilled the system.
     
  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

     
Loading...

Share This Page