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sounds like good advice ta. I'll have to do it in the spring anyway 'cos the missus told me I'm prohibited from any more plumbing until the weather warms up :/

Absolutely spot on CH4... i love you. my wife loves you. my cat loves you. Thanks others as well ;) I had a look inside the feed & expansion cistern - it was totally gunged up with thick sludge and limescale. The cold feed outlet wasn't even visible under the solidified deposits. I removed...

Cheers CH4. I'm going to try this out. The pump thing, btw, was something that confused me a little... i thought that they were supposed to have a bleed screw, but on my model, a Potterton-Myson Compact, I couldn't see one anywhere.

Kevplumb (or anyone)... could you go into a little more detail about a cold feed blockage please? It's looking like this well may be my problem, as although all the radiators are now full, the pump is running hot and noisy if i turn it on, and the boiler automatically switches off after a...

aye the radiator valves are open, along with all the valves on the way to the radiators... but thanks for the sanity check ;) the pipes weren't filling up upstairs either as far as i could see. I tried bleeding the inverted pipe loops and they gave no sign of filling either. I think it's...

aye - i've drained the system again, and the cold feed isn't draining at all. Is there a solution for this?

I've drained my open-vented gravity fed pumped system to fit Danfoss RAS-C2 bi-directional TRVs upstairs. The TRVs are now fitted, and I've turned the water back on to the cold water feed cistern, but my upstairs radiators didn't fill up after a day (i was bleeding all the radiators, but no...