Hi, This is a follow-up from "?introduced an airlock...." earlier. I've ended up draining the system (pumped system). Trouble is it isn't draining the feed+expansion tank. I've managed to get most of a 4.7m drain unblocking coil into the pipe. From the length and feel of the obstruction I think it reached the T junction with the larger diameter CH return pipe. The fluid coming from the system looks pretty clear to me so I wouldn't have thought there is a sludge problem. None of the plumbers I've phoned are available/have got back to me so I'm kind of stuck here. Any pearls of wisdom will be appreciated.
Thanks,
Jon