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Baxi 105 HE Cool radiators

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  • Baxi 105 HE Cool radiators

    Hello all
    1st post so be gentle
    when i moved into the property we had 5 single and 1 double radiators all providing loads of heat
    1 - Kitchen
    1 - Living Room
    1 - Hall
    1 - Bathroom
    1 - Bed 1
    1 - Bed 2
    1 - Study
    1 - Double Dining Room
    Since then ive exchanged some of the singles for doubles
    1 - Living Room
    1 - Bed 1
    1 - Bed 2
    The rest are as original
    when installing the last rad (Bed 2) and recharging system ive noticed that the radiators arent as hot as they were, also the return pipe is cool (all lockshields and TRV are fully open)
    Ive replaced the Grudfos pump for a 3 speed one and set it on speed 3 and put sentinel x800 through the system.
    ive also noticed that when you open the kitchen tap 1/4 turn steam comes off the water flow but if you fully open the tap it is noticeably cooler (the DHW Diaphragm has been changed two days ago)
    ive ordered a CH diaphragm just in case its that and also a new PCB, its also worth noting that the boiler temp very quickly achieves 80 then pilot light extinguishes (no fault LED) and doesn't reignite until 30/40 is reached, any ideas?

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