Re: Central Heating Boiler problem

Discussion in 'UK DIY' started by david.cawkwell@tesco.net, Apr 8, 2010.

  1. Guest

    On Apr 1, 1:27 pm, Paul <> wrote:
    > Today I have a problem with my central heating, the boiler is a Baxi
    > Duo-tec Combi 33 HE.
    > I have hot water but no central heating, the boiler starts to work and
    > then switches itself off after about 30 secs. Initially I believed this
    > was a problem with the pressure as when the boiler started the pressure
    > dropped below the green marked area on the gauge and the boiler stopped
    > (although I did not get an error indication E119 for low pressure).
    > I have repressurised the system and it now shows 1.5bar but the boiler
    > still starts for approx 30 secs then stops.
    > I have also bled the radiators to ensure there is no air in the system.
    >
    > Any help greatly appreciated
    > Paul


    Air pressure sensor.
    Common fault on modern boilers.
     
    , Apr 8, 2010
    #1
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  2. geoff Guest

    In message
    <>,
    "" <> writes
    >On Apr 1, 1:27 pm, Paul <> wrote:
    >> Today I have a problem with my central heating, the boiler is a Baxi
    >> Duo-tec Combi 33 HE.
    >> I have hot water but no central heating, the boiler starts to work and
    >> then switches itself off after about 30 secs. Initially I believed this
    >> was a problem with the pressure as when the boiler started the pressure
    >> dropped below the green marked area on the gauge and the boiler stopped
    >> (although I did not get an error indication E119 for low pressure).
    >> I have repressurised the system and it now shows 1.5bar but the boiler
    >> still starts for approx 30 secs then stops.
    >> I have also bled the radiators to ensure there is no air in the system.
    >>
    >> Any help greatly appreciated
    >> Paul

    >
    >Air pressure sensor.


    Really?

    How does it sense the demand for hot water

    >Common fault on modern boilers.


    Actually its less of a problem on modern boilers that don't have mains
    on the APS microswitch

    I don't know the duo-tech combi but, first thing to check is whether the
    boiler keeps sparking after ignition until it times out - this would
    point to a flame sensing problem

    Next "30 second" probability is associated with the heat exchanger -
    heat is getting in but not being carried away by the water (blockage,
    pump failure or something) - how long does it take to recover ?

    if neither of those, then the next most probable culprit is the pcb

    finally (but I would dismiss this as its unlikely to have a 30 second
    timescale) would be the diverter valve


    --
    geoff
     
    geoff, Apr 9, 2010
    #2
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