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Thanks for the replies chaps - and on the weekend too!! It's a Potterton Suprima 50 and was installed by British Gas just over 10 years ago. It's covered by a BG maintenance contract so has been checked/serviced every year. Apart from needing a replacement main control board back in 2005...

I've just put X400 in my CH system and will be flushing this out in a few weeks. I live in an area with very hard water so I have a water softener which supplies virtually all cold water outlets in the house. Currently this includes the supply to the loft header tank for the CH system (it's...