Every since i drained and filled the sytsem (6 months ago) I get bubbling on only one radiator in the front room. It happens when the system is turned on and bubbles for about 3 seconds and if you turn the valve off then on again after about an hour. The noise comes from the left hand side of the rad. I've bleed all the rads and no air comes out. The rad gets hot and there is no cold spot at the top of the rad.
The tank in the loft is full and its an open system.
Any ideas ?
Thanks.
The tank in the loft is full and its an open system.
Any ideas ?
Thanks.