Megaflo tank little or no pressure

Discussion in 'Plumbing and Central Heating' started by sups, 6 Feb 2020.

  1. sups

    sups

    Joined:
    19 May 2011
    Messages:
    44
    Thanks Received:
    1
    Location:
    London
    Country:
    United Kingdom
    Hello,
    Yesaterday morning I noticed a condsiderable amount of hot water pressure drop from the taps. In the evening when I got home from work I tried to regenerate the air gap according to the instructions, but instead of the gurgling I had hot water flowing through the turndish, I didnt think too much of it and carried on holding the release valve for a few more minutes.
    Then when I tried the hot water tap, there was nothing flowing, it was like there was no pressure in the megaflo tank. A builder friend reckons that the tank pressure only works when the water inside is hot (I didn't think it works like that) .I turned up the temperature a little and I started to get a little bit of water at the taps, still far from normal though.
    Another thing is that I can hear a very low hissing noise coming from the in flow pipe, it's a bit like the noise you get from a pipe when the tap isn't closed properly and there is some water dripping. When I turn off the megaflo inlet isolator valve (which is on the same length of pipe) the hissing stops.

    I don't ever remember hearing this noise in the past when the system was working correctly.

    This together with UFH wo's is driving me a bit crazy.

    Any advice appreciated.
     
  2. picasso

    picasso

    Joined:
    8 Apr 2008
    Messages:
    10,687
    Thanks Received:
    2,687
    Location:
    Essex
    Country:
    United Kingdom
    Have you have mangled the plastic stop tap, take it off and use a spanner to turn the valve fully back on, there is also a filter in the cold water inlet that might be blocked.
     
  3. Sponsored Links
  4. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    24,914
    Thanks Received:
    10,885
    Location:
    Livingston
    Country:
    United Kingdom
    you have to hold it open until the water stops , can sometimes take a while.

    Total rubbish

    You would be better getting a G3 qualified heating engineer in to sort your UFH problem and you UHW cylinder problem, your cylinder is supposed to be serviced every year
     
  5. sups

    sups

    Joined:
    19 May 2011
    Messages:
    44
    Thanks Received:
    1
    Location:
    London
    Country:
    United Kingdom
    Thanks picasso.
    The tap handle does a solid quarter turn.. didn't feel it slipping off the teeth of the nut.. but a valid point.. I'll go home and check

    Your second suggestion is a bit more valid... I called up megaflo tech support (I didn't know they had tech support for us regular consumers) and described the symptoms, the chap said that it sounds like water is not flowing into the tank properly because of some sort of blockage, the hissing sound seems like a small amount of water making it past the blockage, all signs point to either the stop tap, or the valve next to the stop tap.

    I've arranged a Baxi engineer (££££) to come and take a look and fix if possible. I'll report back with what happens.
     
  6. Sponsored Links
  7. sups

    sups

    Joined:
    19 May 2011
    Messages:
    44
    Thanks Received:
    1
    Location:
    London
    Country:
    United Kingdom
    @picasso you were on the money!..just after the cold water inlet tap there is another pressure reducing valve. The engineer came and replaced it
    All working fine now.

    Thanks
     
    • Like Like x 1
  8. 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