Hi
I've just replaced 5 rads and thought I'd use the opportunity to flush the system. I drained the system at the drain cock by the boiler and the other at the lowest rad.
Yesterday I added some Sentinel X400 sludge remover, opened all the rad valves and turned the water back on at the header tank. System filled with lots of gurgling, ran it for 24 hrs. (I didn't bother bleeding any of the rads As I figured any sludge would only be in the lower parts of the rads anyway). Drained it this evening from both cocks with a reassuring medium brown stuff running out.
I've now reopened the valve to the header tank to be greeted with a slow trickle from the header tank (it fills OK and the ball cock cuts off when it should), not the whole system gurgling and filling like yesterday. Opening the odd bleed vent on an upstairs or downstairs rad makes no difference.
I feel there must be an airlock somewhere but I'm not sure where, or how to clear it.
Ideas gratefully accepted.
I've just replaced 5 rads and thought I'd use the opportunity to flush the system. I drained the system at the drain cock by the boiler and the other at the lowest rad.
Yesterday I added some Sentinel X400 sludge remover, opened all the rad valves and turned the water back on at the header tank. System filled with lots of gurgling, ran it for 24 hrs. (I didn't bother bleeding any of the rads As I figured any sludge would only be in the lower parts of the rads anyway). Drained it this evening from both cocks with a reassuring medium brown stuff running out.
I've now reopened the valve to the header tank to be greeted with a slow trickle from the header tank (it fills OK and the ball cock cuts off when it should), not the whole system gurgling and filling like yesterday. Opening the odd bleed vent on an upstairs or downstairs rad makes no difference.
I feel there must be an airlock somewhere but I'm not sure where, or how to clear it.
Ideas gratefully accepted.