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Boiler overheating baxi solo 2 40pf overheating been using this boiler over the summer for hot water tried it the other day for heating upstairs radiators got red hot downstairs luke warm pump makeing screeching noise now overheates within minutes on hot water and heating pump is still turning boiler and exit pipes red hot pump red hot tried bleeding rads and pump i have just fitted new radiator in bathroom and there was a lot of black sludge in old 1 this did new rad did get hot other day just swapt them over im thinking pump or system flushing out or both any ideas? oh the overheat light goes out after boiler cools down and then i can start again but then it overheats

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  • anth1 Oct 18, 2008

    sorry this is a gas fired boiler with storage tank i cleaned the pump out and fould the float valve on the heder tank sticking meaning insusiant flow of water in the system so replaced valve put in a system flush now working fine thanks

  • Anonymous Mar 16, 2014

    woke up this morning with no heating or hot water boiler showed code a04

  • Anonymous Mar 16, 2014

    woke up this morning with no heating or hot water boiler showed code a04

  • Anonymous Mar 22, 2014

    Installed today, but when the boiler fills up and heats, after a minute or so the red warning light comes on, then it disperses hot water out the vent

  • Anonymous Mar 28, 2014

    Pump wouldn't start, changed pump motor and starts fine but running very hot.

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The problem there a relay stuck or thermostat bring on the pump & you can lower your high limit aquastat!! also the flow valves can bypass hot hot water risers time to put in a seperate water heater domestic coil are not energy efficient !!!! aquastat high limit set @ 180f deg low limit set @ 140f deg!!!
good luck!!! tim

Posted on Oct 18, 2008

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