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Please can anyone advise me how i get any trapped air out of my central heating system. I have already bled the radiators but i still think i have air trapped in the system !!! i would be grateful for any advise :)

How do i check if we have a bypass what do you mean by s-plan ?????

We have a potterton Suprima 30 boiler which keeps locking out due to over heating. We have already replaced the PCB & Thermistor & Overheat Stat none of these have resoved our problem. Could it now be the pump is there any way of checking to see if it is faulty. Can anyone help before we have to...