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

Vaillant Ecomax boiler pressure gradually dropping daily

Discussion in 'Plumbing and Central Heating' started by testing1234, 14 Jun 2016.

  1. testing1234

    testing1234

    Joined:
    14 Jun 2016
    Messages:
    1
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi guys,

    I've had problems with my boiler dropping pressure since the last few months. Particularly after having the heating on. It wouldn't go up and over 3, but would go down to 0. So I've been topping it up daily. Alongside my living room radiator that had a leak from a nut on one side - clearly down to corrosion/rust around the base the nut tightened into.

    Regarding the rad. I isolated all the rads one night, wrapped tissue paper around each rad's pipes and topped up boiler pressure. It still dropped to 0 and there was no sign of a rad leak. So this indicated an issue with the boiler as well. I found out it could be a fault with the expansion vessel, either needing re-pumping or replacing.

    I had a guy come and check. He showed me that there was some water leak from the expansion vessel relief valve. So he advised it needed changing. I got the part and he changed. He also applied ptfe tape to the leaking rad. Anyway, since the fix, I still notice a gradual drop in pressure on a daily basis. I topped to 1.1 last Monday [6th]. This morning it's down to 0.7. This is all without turning the heating on.

    So, is there any other part that maintains pressure? I heard something about a rubber diaphragm. Other than that, what else could be the issue... leak somewhere else? How can I investigate?

    Thanks
     
  2. 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

     
  3. Sponsored Links
Loading...

Share This Page