Overheating and cut off on Vaillant ecoTec plus 637

Discussion in 'Plumbing and Central Heating' started by Goku, 17 Feb 2018.

  1. Goku

    Goku

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    Do the noises indicate any apparent problems like trapped air or pump issues? Drained and re-filled system last night to remove any trapped air but no joy as you can see; even if it's just on hot water to only heat the cylinder which is the closest 'radiator' to the boiler (also tried heating last night).

    Been like this for a few days and even had emergency engineer out who reckons it's just trapped air and auto-air vent in boiler should be replaced first.



    Notes:
    1. System power-flushed over the weekend - so almost 100% certain that some residual debris has blocked a part of the sytem
    2. Flow pipe gets very hot and past the zone valves too
    3. Auto air valve in boiler is leaking and is going to be replaced; but still lets out air when I turn it
    4. System completely drained and refilled last night - air taken out after refill and this morning
    5. Past few years, we've had to live with the boiler running for a while (never counted time, but assume 10 minutes) then cutting off as it would get too hot, then run again in a similar fashion (assume because hot water wan't being pumped away fast enough)
     
    Last edited: 17 Feb 2018
  2. jeff the gasman

    jeff the gasman

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    Get a proper boiler engineer in. Not an emergency plumber.
     
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  4. Goku

    Goku

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    I think he was a boiler engineer, just used the wrong term
     
  5. Goku

    Goku

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    Turns out it just needed a second powerflush :whistle:
     
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