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I have a potterton bolier, it lights for about 5 mins and then cuts out, you then hear airflow (have connected mains to hot tap and flushed to vent cold water tank, emptied rads, they are not filling and vent tank is full. i have a grundig pump and motorised valve. please help

How do change the motor? Having problems refilling central heating system (does overflow pipe into expansion tank need to be out of the water?)