One of our radiators keeps getting blocked off. It is one in the sitting room. We have one under the bay window and a smaller one the other end - used to be dinning room and separate sitting room.
It is an old system that has had some upgrade work done to it over the years. I had this radiator off in isolation and noticed a lot of black sludge at the out flow. I thought that that was causing the blockage. I cleaned the valve and flushed the radiator through with a hose. I put it back on and it worked for a few days only to stop warming up again. So I drained the whole system and had this radiator off again, but this time there was no visible sludge. I have flow from both in and out flow. I added a sludge remover a couple of weeks ago before filling the system. Last night I notice the radiator being stone cold again. I guess some sludge is acting like a valve somewhere in the pipes. What else can I do in order to get the radiator working reliably??
Originally my plan was to drain the system again after 4 weeks and add inhibitor, but I think this will have to wait.
It is an old system that has had some upgrade work done to it over the years. I had this radiator off in isolation and noticed a lot of black sludge at the out flow. I thought that that was causing the blockage. I cleaned the valve and flushed the radiator through with a hose. I put it back on and it worked for a few days only to stop warming up again. So I drained the whole system and had this radiator off again, but this time there was no visible sludge. I have flow from both in and out flow. I added a sludge remover a couple of weeks ago before filling the system. Last night I notice the radiator being stone cold again. I guess some sludge is acting like a valve somewhere in the pipes. What else can I do in order to get the radiator working reliably??
Originally my plan was to drain the system again after 4 weeks and add inhibitor, but I think this will have to wait.