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Thread: Myson Marathon 40 pilot light will not stay lit

  1. #1
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    Default Myson Marathon 40 pilot light will not stay lit

    I'm new to this forum and hope there's someone who can remember this model. It's about 20 years old worked brilliantly until recently found pilot light out, tried to re-light without success. Have replaced thermo coupler but still she won't light. Any ideas please?

    Thanks.

  2. #2
    Moderator sunbeam's Avatar
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    Default Re: Myson Marathon 40 pilot light will not stay lit

    there is an overheat button inside the case on a pipe,

    small red button,

    give it a press,

    turn power to the boiler off, it's 240v

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    Default Re: Myson Marathon 40 pilot light will not stay lit

    I know the boiler pretty well, but I cannot find the overheat button you refer to, I'm sure it doesn't have one. I have changed the thermocoupler but the pilot light goes out as soon as the button/valve is released.

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    Default Re: Myson Marathon 40 pilot light will not stay lit

    The problem was the gas valve which needed to be replaced at a cost of 88 plus fitting. Should be good for another 20 years!

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    Default Re: Myson Marathon 40 pilot light will not stay lit

    RE MARATHON 40 , My Boiler has worked well but since i moved its location it has been a bit iffy! at present when it heats up it throws the rcd switch causing the whole electrical system in the house to close down! can any one help?

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    Default Re: Myson Marathon 40 pilot light will not stay lit

    sorry can't help, my 20 year old Myson Marathon 40 doesn't have this red reset button referred to by an earlier response.

  7. #7
    Moderator sunbeam's Avatar
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    Default Re: Myson Marathon 40 pilot light will not stay lit

    if its doing this when it has got up to temperature its probably the boiler stat,
    is it doing this on water and heating or water only,
    if it's doing it on water only it could be the cylinder stat,

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    Quote Originally Posted by sunbeam
    if its doing this when it has got up to temperature its probably the boiler stat,
    is it doing this on water and heating or water only,
    if it's doing it on water only it could be the cylinder stat,
    Thanks guys! I had an idea and fired the boiler up by bypassing all the controls to see what happens and it seems to work ok! when I then bypassed the stat, still ok so I agree a new stat required!, but i am not optemistic I can get one for such a old model!

  9. #9
    Moderator sunbeam's Avatar
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    Default Re: Myson Marathon 40 pilot light will not stay lit

    I'm sure you won't have any trouble getting one,
    they're a common stat,
    off the shelf at parts centre.

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    Thats good news ! Thanks again .

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