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thanks for the replies, by the way. good to see a forum where people with knowledge respond so quickly...cheers!

hmm, thats what I thought. perhaps I have a faulty WPS. How would I check that? I suppose I could turn off the water mains and see if the light pops up, but I dont really want to blow myself up. Also, with the pressure relief valve, tried to get rid of any sludge. But when you say 'turn it...

thanks for that, i will give it a try. Another Q: now that the water in the CH loop wil be new, do I need to get someone in to give it some 'treatment'? I guess de-oxygenate or something, just heard that this is sometimes done? cheers Slay

Well that should say: 'Potterton Lynx II boiler discharging CH water through waste pipe' I had a problem when I came back from a business trip, and found the 'low pressure' light on and boiler inoperative. The CH pressure guage did show low pressure (a v slow leak somewhere over the years...