Boiler lights intermittently

Discussion in 'Motorhome Chat' started by Patrick, Feb 5, 2010.

  1. Patrick

    Patrick Read Only Funster

    Nov 18, 2007
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    Hi All,

    Dos anyone have Alde wet heating?

    I have had a problem since the New Year meet, the problem is this!

    Often when I turn the boiler on I hear the gas valve clunk open and after 10 seconds the red light comes back on and a second clunk as the valve shuts. This will happen every time I try it over a few hours. The motor, flue and pump are all working fine while the boiler won’t light by the way.

    I can light all the burners on the hob, the oven and gas fridge and all work properly with no reduction in flame when all are lit.

    I have changed the gas regulator. The old one said it was 30Mb and a flow of 1.7flow, the new one is 30MB but is only 1.5 flow.

    I have an external gas tank which is filled with LPG from a shell forecourt, don’t think its freezing, but who knows?

    I have had the flue gas analysed and everything was reading fine,

    Does anyone have any ideas for me to try?????????????????????????

    Could it be just another faulty gas regulator I have fitted??????????????

    I can go to it an hour later and it all works on the gas but will cut of after about 2-3 hours and won’t light again till the next day.

    I can run both heating and hot water of the electric no problem.
  2. froghopper

    froghopper Read Only Funster

    Nov 29, 2009
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    boiler wont light

    good morning, had same problem, different type, if you get an air lock it will do this, normaly mine self bleeds, this year , didnt, somewhere there is a bleed screw/ valve/ top. only needs a very small bit of air, sorry cant help more,, good luck,, :thumb:
  3. ips

    ips Read Only Funster

    Jul 3, 2009
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    Not familiar with this particular boiler but it sounds like an ignition fault. If the burner flame sensor does not detect a flame within a few seconds then it will shut down, that is the "clunck" from the valve that you can hear. You either have....

    Little or no spark being generated by the ignition unit
    faulty igniter unit
    faulty / badly placed igniter probe
    faulty igniter lead
    igniter lead shorting somewere

    or your pilot / burner flame is too small for the flame sensor to detect
    blocked jet
    poor gas supply

    As a reg gas installer I would have to advise that you get it sorted by a pro unfortunately installers registered to work on "mobile caravan" installations are few and far between so good luck.
  4. haganap

    haganap Funster Life Member

    Dec 5, 2007
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    have you had the gas pressure tested Pat?

    It could be all the above but the puzzling thing is why it works for some time but not others, or have I read that wrong.

    does it work on normal gas still? out of a bottle? or have you not tried that?

    Think its going to be a case of narrowing it down bit by bit, but start with the least expensive:thumb:
  5. pappajohn

    pappajohn Funster Life Member

    Aug 26, 2007
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    YO11 2BD
    same as IPS.....flame failure device.
    electronics hold gas valve open for a set period (10 seconds) until flame sensor gets hot and the sensor holds the valve open....

    sensor not working...valve shuts after the 10 second 'warm up' period.

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