Baxi Solo 3 series Boiler Problem

Discussion in 'UK DIY' started by Richard, Aug 24, 2005.

  1. Richard

    Richard Guest

    I've got a problem with the Baxi boiler in my home.
    I've been unable to get to the bottom of the problem after
    a run through the fault finding guide in the booklet and also done some
    limited testing with a circuit tester to make sure that resistance etc
    occurs in the places that it suggests it should.
    This has brought me to a dead end and i'm quite happy to admit i'm getting
    out of my depth.

    So on to the point -

    The boiler will start up as normal and run for around 5 minutes - the
    radiators get nice a toasty, etc.
    After 5 minutes the burner will cut out and the gas flow is cut off (a quick
    observation of the gas meter numbers shows this to be the case).

    Since the overheat light isn't coming on and all the radiators get nice and
    warm that seems to rule the pump out.

    After the cutout the fan keeps running and the electronic ignition keeps
    trying to reignite the system (to no effect as gas isn't been supplied).
    The system then fails to do anything else for the "run time" set on the
    timer.
    If i choose to turn the system off the "pilot light" stays lit (on as a low
    flickering light) until the system is force reset / cools down.

    At which point the whole sorry story starts again.

    I'm reasonably new to the area i live in and i'm a little bit cautious of
    getting a "man in" if i don't have at least a rough idea of what the problem
    is likely to be...

    I would have spoken to the original fitter but he/she didn't bother to fill
    out the installation document (the same applies for everyone on my estate -
    i asked).
    I'd also like to ask them why the temperature sensor and overheat sensor are
    conected to the pipework in the wrong order (but thats another story and
    since it's worked reasonably well for a couple of years it doesn't seem to
    be the likely culprit(?))

    Has anyone seen anything (fault wise) similar to this with this type of
    system before and if so could you point me in the right direction as to what
    the likely cause of the problem is.

    cheers,
    -
    Richard
    Richard, Aug 24, 2005
    #1
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  2. Richard

    raden Guest

    In message <>, Richard
    <> writes
    >I've got a problem with the Baxi boiler in my home.


    .... ...

    >
    >After the cutout the fan keeps running and the electronic ignition keeps
    >trying to reignite the system (to no effect as gas isn't been supplied).
    >The system then fails to do anything else for the "run time" set on the
    >timer.
    >If i choose to turn the system off the "pilot light" stays lit (on as a low
    >flickering light) until the system is force reset / cools down.
    >


    Do you mean the pilot neon is flickering ?

    Is the spark igniting the pilot but continuing to spark and not lighting
    the main burner ?

    The Solo 3 pcb energises the pilot valve at the same that it generates
    the spark

    No pilot ----> check to see if there is mains across the pilot valve
    solenoid

    If the pilot valve is lit, then, if it keeps on sparking, the board is
    not sensing the flame

    This could be due to the pcb, or the HT lead

    I'm discounting other possibilities at this point as they are less
    likely and it seems to be either time or temperature dependent

    --
    geoff
    raden, Aug 25, 2005
    #2
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  3. Richard

    Richard Guest

    >
    > Do you mean the pilot neon is flickering ?


    Yes thats what i meant.
    I probably didn't explain that very well the first time around.

    The boiler on neon will also remain on if something is demanding
    service.

    > Is the spark igniting the pilot but continuing to spark and not lighting
    > the main burner ?


    The spark doesn't appear to be igniting anything at all.
    Would i expect to see at least some gas usage from the mains supply when
    this is occurring? (because i don't)

    > The Solo 3 pcb energises the pilot valve at the same that it generates
    > the spark
    > No pilot ----> check to see if there is mains across the pilot valve
    > solenoid


    Will do.

    > If the pilot valve is lit, then, if it keeps on sparking, the board is
    > not sensing the flame


    I don't believe the pilot valve is lit.

    > This could be due to the pcb, or the HT lead


    > I'm discounting other possibilities at this point as they are less
    > likely and it seems to be either time or temperature dependent.


    Seems likely to me also.
    Richard, Aug 25, 2005
    #3
  4. Richard

    raden Guest

    In message <>,
    Richard <> writes
    >>
    >> Do you mean the pilot neon is flickering ?

    >
    >Yes thats what i meant.
    >I probably didn't explain that very well the first time around.
    >
    >The boiler on neon will also remain on if something is demanding
    >service.
    >
    >> Is the spark igniting the pilot but continuing to spark and not lighting
    >> the main burner ?

    >
    >The spark doesn't appear to be igniting anything at all.
    >Would i expect to see at least some gas usage from the mains supply when
    >this is occurring? (because i don't)
    >

    As I said, the pcb energises the PV solenoid at the same time as the
    spark.

    Are there volts to the pilot valve when it sparks ?

    Yes ----------> faulty valve / solenoid
    No------------> pcb fault

    It might be worth checking that the PV solenoid isn't open circuit first

    --
    geoff
    raden, Aug 25, 2005
    #4
  5. Richard

    Richard Guest

    > Are there volts to the pilot valve when it sparks ?
    >
    > Yes ----------> faulty valve / solenoid
    > No------------> pcb fault
    >
    > It might be worth checking that the PV solenoid isn't open circuit first


    Turns out it was a fault with the pilot solenoid.
    I assume the coil (or something similar) has started to break down.

    cheers for the help.

    -
    Richard
    Richard, Sep 2, 2005
    #5
  6. Richard

    MikeB Guest

    Richard Wrote:
    >
    > The boiler will start up as normal and run for around 5 minutes
    >
    > After 5 minutes the burner will cut out and the gas flow is cut off (
    > quick
    > observation of the gas meter numbers shows this to be the case).
    >
    > Since the overheat light isn't coming on and all the radiators get nic
    > and
    > warm that seems to rule the pump out.
    >
    > After the cutout the fan keeps running and the electronic ignitio
    > keeps
    > trying to reignite the system (to no effect as gas isn't bee
    > supplied).
    > The system then fails to do anything else for the "run time" set o
    > the
    > timer.
    > -
    > Richard


    Hi,

    I appear to have the same syptoms as posted by richard on my baxi sol
    2 boiler, possibly with a slight difference in that I noticed relay2 o
    the pcb shut prior to the burner cutting out. I've changed the pcb bu
    to no effect, any suggestions?

    Mike

    --
    MikeB
    MikeB, Dec 7, 2005
    #6
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