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I'll have a look at that. I left it running for about 4 hours and the radiators upstairs did eventually get piping hot, so I think the system is simply running slow rather than not running at all. It wasn't immediately obvious at first. I've had the pump out and flushed the inside with a...

I was afraid of that myself. At the minute though it seems that water is getting through the system albeit very slowly. The return is getting very very gradually warmer. It's been on a number of hours now and it slightly warmer than tepid. I'm wondering (what with a powerflush being an expensive...

I've lurked about the forum looking for an answer to this but anything I've tried doesn't seemed to have helped, so I thought I'd register and ask. I few weeks ago I got a dscaler and added it to my central heating system. The system is vented and has a pump. I drained enough water to get the...