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The system is run on Economy-7. It heats up a huge tank of hot water overnight then feeds it through the radiators when the timer comes on (dhw is provided separately) The CH pump is running and I even turned it up from low to high.

Only the radiator in the hall was flushed out. The plumber removed it and took it into the garden where he flushed it out with a hosepipe over the outside drain. The water that came out the other end was very black. Once refitted, he couldn't work out why it didn't heat up and declared he had...

When our boiler starts, most of the upstairs radiators heat up fairly quickly but all the downstairs radiators (and one upstairs) take a long time to warm up (about 2 hours) and even then, only become warm rather than hot. The pipes into all the radiators are piping hot. I've tried bleeding...