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Discuss Firebird problem in the Central Heating Forum area at

  1. talos

    talos New Member

    First post and of course its a problem.
    I have a Firebird combi 7 oil fired, in most respects it is working fine, my problem is that the domestic side is feeding hot water to the radiators even when the central heating is switched off, neither pumps are running at the time but the burner is, presumably to top up the heatstore, this makes the first radiator very hot and the others warm, has anybody a clue as to where the fault lies.
  2. talos

    talos New Member

    Anyone ?
    Just a clue please :disappointed: I would be most gratefull
  3. Chalked

    Chalked Plumber GSR

    I take its a combi? If it is. The three way motorised valve will be passing. A new one ( body and head) are an easy swap.
  4. talos

    talos New Member

    Thanks, yes it is a combi but no 3 way valve, it uses two pumps instead and neither are running but the rads still get hot.
  5. TVP&H Ltd

    TVP&H Ltd Member

    Faulty non return valve on the heating side.
  6. talos

    talos New Member

    That's a real possibility, I was hoping it was not that because it looks like the boiler will almost need total strip down to get at it. If I leave it till better weather to tackle the problem am I likely to cause more damage ?
  7. TVP&H Ltd

    TVP&H Ltd Member

    If its easier to do just fit a non return valve into the return pipe just before it goes back to the boiler.
  8. lame plumber

    lame plumber Guest

    if you have vertical pipework straight out of the boiler that will be the cause of the problem, so a non return valve is the answer - fitted in the correct direction to save totally fubarring your pump on the heating circuit
  9. talos

    talos New Member

    Thanks guys, that sounds a good idea, the pipework is vertical but relatively easy to get at.
  10. TVP&H Ltd

    TVP&H Ltd Member

    Remember to drain system fully and refill using a suitable inhibitor (I.E. Fernox mb1) or similar as to reduce internal corrosion of heating system and boiler.
    • Like Like x 1
  11. talos

    talos New Member

    I always use Fernox, the can seem a lot smaller now is it still the same strength ?
    I seem to remember a 5 year G'tee was the norm with an annual test of drawing a sample and immersing a steel nail in it as an anti rust strength test, but I am going back 20+ years ago.
    • Like Like x 1
  12. pammyT

    pammyT New Member

    ooh I know this one. My brand new Firebird boiler was doing the same. Turns out there is a NRV and that gets jammed. They sent a man to fix it, with it being less than a week old. Now it's 3 weeks old and that problem is solved and all I now have to do it try to get the water above lukewarm.
    I am really angry because I checked online for reviews before I chose this and I'm wondering if Firebird gets their employees to write good ones for otherwise rubbish boilers.
  13. sammathias

    sammathias GSR

    Went on a vailliant course last month and the bloke showed us the trusted fernox and nail sample, just to purely laugh at because the corrosion was crazy. Youd swear it was in water
  14. sammathias

    sammathias GSR

    Firebirds are leak machines.
    • Like Like x 1
  15. Chuck

    Chuck Active Member

    Fernox doesn't need to prevent corrosion indefinitely in a small sample of water with the nail a cm or two from the free surface in order to be effective inside a CH system.

    That test when performed correctly is to check for the presence of Fernox in a reasonable concentration. It requires two samples: one tap water and one taken from the heating system. Put a test piece comprising a piece of copper pipe with a nail banged through it in each jar. Compare after a week. If there is Fernox in the system the nail will be nice and bright.

    If you keep the samples for months both nails will corrode. If you keep meat in a refrigerator for a few months it will go off. One can't conclude the refrigerator doesn't work from that observation.
  16. Best

    Best Trusted Plumber Top Contributor!!

    Fernox a few decades ago was brilliant stuff and really prevented corrosion. It had a strong smell and had foaming properties, only present when you drained the system and the water dropping into a gulley would froth.
    The new Fernox seems entirely different and I wonder if it is worth using, rather than other brands
    • Like Like x 1
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