Problem with Glow-worm boiler

Discussion in 'UK DIY' started by mightyhugh@yahoo.co.uk, Feb 1, 2006.

  1. Guest

    My boiler, a Glow-worm space saver F, has stopped working. Its normal
    sequence of operation when starting up is that the flue extractor fan
    starts running, then a spark electrode lights a pilot light which then
    lights the main burner. However, now all that happens when you switch
    it on is a clunk and a faint whirring sound (I'm not sure if this is
    coming from the boiler itself or just water circulating from the water
    pump). There doesn't seem to be any air blowing out from the flue and
    there is no sparking at the pilot light. Does anyone here have any idea
    what might have gone wrong and how to fix it?
    , Feb 1, 2006
    #1
  2. Fentoozler Guest

    "Christian McArdle" <> wrote in message
    news:43e0dc4b$0$274$...
    >> My boiler, a Glow-worm space saver F, has stopped working. Its normal
    >> sequence of operation when starting up is that the flue extractor fan
    >> starts running, then a spark electrode lights a pilot light which then
    >> lights the main burner. However, now all that happens when you switch
    >> it on is a clunk and a faint whirring sound (I'm not sure if this is
    >> coming from the boiler itself or just water circulating from the water
    >> pump). There doesn't seem to be any air blowing out from the flue and
    >> there is no sparking at the pilot light. Does anyone here have any idea
    >> what might have gone wrong and how to fix it?

    >
    > Well, you say the first element in the sequence is the fan starting. There
    > will be various fail-safe mechanisms that abort the lighting sequence if
    > the
    > fan fails.
    >
    > So perhaps the fan is not starting for a reason. Either it is broken, or
    > the
    > cable to it is, or the PCB is knackered.
    >
    > There may be other failsafe devices, too. Perhaps the first step is really
    > to start the water flow and only to proceed when flow is detected. I don't
    > know enough about the boiler. Hopefully Ed Sirrett or raden will be along
    > soon with the actual sequence or most likely failure mode for this boiler.
    >
    > Christian.
    >
    >
    >


    If the fan doesn't get up to speed, the air pressure switch won't click over
    and nothing else will work. you could try lubricating the fan assembly,
    else replace it. If the fan is getting up to speed, your air pressure
    switch may be faulty.

    Angus
    Fentoozler, Feb 1, 2006
    #2
  3. Ed Sirett Guest

    On Wed, 01 Feb 2006 16:05:32 +0000, Christian McArdle wrote:

    >> My boiler, a Glow-worm space saver F, has stopped working. Its normal
    >> sequence of operation when starting up is that the flue extractor fan
    >> starts running, then a spark electrode lights a pilot light which then
    >> lights the main burner. However, now all that happens when you switch
    >> it on is a clunk and a faint whirring sound (I'm not sure if this is
    >> coming from the boiler itself or just water circulating from the water
    >> pump). There doesn't seem to be any air blowing out from the flue and
    >> there is no sparking at the pilot light. Does anyone here have any idea
    >> what might have gone wrong and how to fix it?

    >
    > Well, you say the first element in the sequence is the fan starting. There
    > will be various fail-safe mechanisms that abort the lighting sequence if the
    > fan fails.
    >
    > So perhaps the fan is not starting for a reason. Either it is broken, or the
    > cable to it is, or the PCB is knackered.
    >
    > There may be other failsafe devices, too. Perhaps the first step is really
    > to start the water flow and only to proceed when flow is detected. I don't
    > know enough about the boiler. Hopefully Ed Sirrett or raden will be along
    > soon with the actual sequence or most likely failure mode for this boiler.
    >

    I've only met a couple of these boilers. However if the fan is not running
    then the acid test is to see if it's getting any power.

    I have no reason to doubt raden's belief that these boilers have
    troublesome fans.


    --
    Ed Sirett - Property maintainer and registered gas fitter.
    The FAQ for uk.diy is at http://www.diyfaq.org.uk
    Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
    Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
    Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
    Ed Sirett, Feb 1, 2006
    #3
  4. John Guest

    <> wrote in message
    news:...
    > My boiler, a Glow-worm space saver F, has stopped working. Its normal
    > sequence of operation when starting up is that the flue extractor fan
    > starts running, then a spark electrode lights a pilot light which then
    > lights the main burner. However, now all that happens when you switch
    > it on is a clunk and a faint whirring sound (I'm not sure if this is
    > coming from the boiler itself or just water circulating from the water
    > pump). There doesn't seem to be any air blowing out from the flue and
    > there is no sparking at the pilot light. Does anyone here have any idea
    > what might have gone wrong and how to fix it?
    >

    The clunk could te easily be the fan having failed bearings and instead of
    spinning the magnetic field drags the rotor sideways onto the stator.
    If you are competent open up the dasing and watch what happens.
    If the fan is at fault try Geoff at CET
    John, Feb 1, 2006
    #4
  5. raden Guest

    In message <43e0dc4b$0$274$>, Christian
    McArdle <> writes
    >> My boiler, a Glow-worm space saver F, has stopped working. Its normal
    >> sequence of operation when starting up is that the flue extractor fan
    >> starts running, then a spark electrode lights a pilot light which then
    >> lights the main burner. However, now all that happens when you switch
    >> it on is a clunk and a faint whirring sound (I'm not sure if this is
    >> coming from the boiler itself or just water circulating from the water
    >> pump). There doesn't seem to be any air blowing out from the flue and
    >> there is no sparking at the pilot light. Does anyone here have any idea
    >> what might have gone wrong and how to fix it?

    >
    >Well, you say the first element in the sequence is the fan starting. There
    >will be various fail-safe mechanisms that abort the lighting sequence if the
    >fan fails.
    >
    >So perhaps the fan is not starting for a reason. Either it is broken, or the
    >cable to it is, or the PCB is knackered.
    >
    >There may be other failsafe devices, too. Perhaps the first step is really
    >to start the water flow and only to proceed when flow is detected. I don't
    >know enough about the boiler. Hopefully Ed Sirrett or raden will be along
    >soon with the actual sequence or most likely failure mode for this boiler.
    >

    Well, a bit more info would have been useful. It sounds like all that is
    happening is that the pump is probably running and the fan isn't. Given
    that baseline ...

    Diagnostics would require a DVM and carried out in the following order
    and can all be performed at or near the pcb

    1/ Is there 240V between the live and neutral on the PCB (Blue and brown
    flying leads)

    2/ Is the overheat stat open circuit as measured at the pcb (yellow and
    white flying leads

    3/ Are there volts to the Fan ? (connector which plugs into the pcb




    --
    geoff
    raden, Feb 1, 2006
    #5
  6. Cicero Guest

    <> wrote in message
    news:...
    > My boiler, a Glow-worm space saver F, has stopped working. Its normal
    > sequence of operation when starting up is that the flue extractor fan
    > starts running, then a spark electrode lights a pilot light which then
    > lights the main burner. However, now all that happens when you switch
    > it on is a clunk and a faint whirring sound (I'm not sure if this is
    > coming from the boiler itself or just water circulating from the water
    > pump). There doesn't seem to be any air blowing out from the flue and
    > there is no sparking at the pilot light. Does anyone here have any idea
    > what might have gone wrong and how to fix it?
    >


    ===============
    The 'whirring' sound which you describe might be the fan working normally
    (despite the fact that there is apparently no air blowing out). The tubes
    from the fan to the air switch have a tendency to block up (only about 3mm
    ID). If this happens the light-up procedure fails. If you are confident
    enough open the boiler, disconnect the air tubes and check that they're
    clear of obstruction.

    Cic.
    Cicero, Feb 1, 2006
    #6
  7. raden Guest

    In message <>, Ed
    Sirett <> writes
    >On Wed, 01 Feb 2006 16:05:32 +0000, Christian McArdle wrote:
    >
    >>> My boiler, a Glow-worm space saver F, has stopped working. Its normal
    >>> sequence of operation when starting up is that the flue extractor fan
    >>> starts running, then a spark electrode lights a pilot light which then
    >>> lights the main burner. However, now all that happens when you switch
    >>> it on is a clunk and a faint whirring sound (I'm not sure if this is
    >>> coming from the boiler itself or just water circulating from the water
    >>> pump). There doesn't seem to be any air blowing out from the flue and
    >>> there is no sparking at the pilot light. Does anyone here have any idea
    >>> what might have gone wrong and how to fix it?

    >>
    >> Well, you say the first element in the sequence is the fan starting. There
    >> will be various fail-safe mechanisms that abort the lighting sequence if the
    >> fan fails.
    >>
    >> So perhaps the fan is not starting for a reason. Either it is broken, or the
    >> cable to it is, or the PCB is knackered.
    >>
    >> There may be other failsafe devices, too. Perhaps the first step is really
    >> to start the water flow and only to proceed when flow is detected. I don't
    >> know enough about the boiler. Hopefully Ed Sirrett or raden will be along
    >> soon with the actual sequence or most likely failure mode for this boiler.
    >>

    >I've only met a couple of these boilers. However if the fan is not running
    >then the acid test is to see if it's getting any power.
    >
    >I have no reason to doubt raden's belief that these boilers have
    >troublesome fans.
    >

    No, that's Fuelsavers, the Spacesaver has a completely different fan

    --
    geoff
    raden, Feb 1, 2006
    #7
  8. Ed Sirett Guest

    On Wed, 01 Feb 2006 23:51:49 +0000, raden wrote:

    > In message <>, Ed
    > Sirett <> writes
    >>On Wed, 01 Feb 2006 16:05:32 +0000, Christian McArdle wrote:
    >>
    >>>> My boiler, a Glow-worm space saver F, has stopped working. Its normal
    >>>> sequence of operation when starting up is that the flue extractor fan
    >>>> starts running, then a spark electrode lights a pilot light which then
    >>>> lights the main burner. However, now all that happens when you switch
    >>>> it on is a clunk and a faint whirring sound (I'm not sure if this is
    >>>> coming from the boiler itself or just water circulating from the water
    >>>> pump). There doesn't seem to be any air blowing out from the flue and
    >>>> there is no sparking at the pilot light. Does anyone here have any idea
    >>>> what might have gone wrong and how to fix it?
    >>>
    >>> Well, you say the first element in the sequence is the fan starting. There
    >>> will be various fail-safe mechanisms that abort the lighting sequence if the
    >>> fan fails.
    >>>
    >>> So perhaps the fan is not starting for a reason. Either it is broken, or the
    >>> cable to it is, or the PCB is knackered.
    >>>
    >>> There may be other failsafe devices, too. Perhaps the first step is really
    >>> to start the water flow and only to proceed when flow is detected. I don't
    >>> know enough about the boiler. Hopefully Ed Sirrett or raden will be along
    >>> soon with the actual sequence or most likely failure mode for this boiler.
    >>>

    >>I've only met a couple of these boilers. However if the fan is not running
    >>then the acid test is to see if it's getting any power.
    >>
    >>I have no reason to doubt raden's belief that these boilers have
    >>troublesome fans.
    >>

    > No, that's Fuelsavers, the Spacesaver has a completely different fan


    .... if any fan at all.



    --
    Ed Sirett - Property maintainer and registered gas fitter.
    The FAQ for uk.diy is at http://www.diyfaq.org.uk
    Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
    Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
    Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
    Ed Sirett, Feb 2, 2006
    #8
  9. raden Guest

    In message <>, Ed
    Sirett <> writes
    >>>
    >>>I have no reason to doubt raden's belief that these boilers have
    >>>troublesome fans.
    >>>

    >> No, that's Fuelsavers, the Spacesaver has a completely different fan

    >
    >... if any fan at all.
    >

    Well, yes

    From where I stand, If I know there's a Fuelsaver fan, I don't
    necessarily know that there's a version without a fan

    --
    geoff
    raden, Feb 2, 2006
    #9
  10. Guest

    It turned out the fan was jammed. Thanks for your help everyone.

    Hugh
    , Feb 4, 2006
    #10

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