Hi can anyone help when the hot water and heating come on in the morning the rads wont heat up untill the water is hot and this happens any time it needs to heat the water. i,ve got a Y system the 3 way valve is new the pump is ok when its calling for water and heating the valve is in the mid position and the pipe from the valve to the rads gets hot but it just don't seem to circulate the water all round the rads while its heating the water,as soon as the waters up to temp the rads get hot.
Thanks John
Thanks John