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We have had the drain flushed from outside, but not from the sink/shower side. Do you think there's likely a blockage, rather than poor plumbing? I haven't noticed any draining issues, other than the water coming up when a full sink is emptied. Just running the basin tap doesnt do it.

Hidden away under tiles. Final picture is back of the basin.

I mean hand basin in the cloakroom, not the kitchen sink.

Yes i did. None of them have been able to spot anything suspect, but they have all come from the outside manhole and havent been able to look at the plumbing direcrly under the shower or after.

We have an electric shower in the downstairs toilet, that is rarely used. It was installed by the previous owners. When the sink is filled and the plug taken out, water comes up the shower drain and its usually full of black gunk. We have a persistent smell of sewer in the house that we...

The radiator is an old (antique old) cast iron column rad. How would I know if it has a specific flow and return? The issue is not with the temp dropping - I have that under control. Most of the rads in the house are slow to heat, but that is to be expected with the setup. With this radiator...

Done this recently. That wasn't the issue.

I have one radiator in my living room, where the return valve gets hot, but the water does not seem to flow up through the intake valve - so the radiator gets very slowly but from the bottom. Is it possible that the radiator has been fitted the wrong way round, where the return should actually...

Is it a good idea to use epoxy in the meantime?

After moving a set of draws I've found a spot on my one pipe central heating flow that's rusted and leaking very slightly. I was planning to cover the spot in epoxy repair paste and hoping that stops further damage, but is that a good idea? How big of a job is it to fix this otherwise?

I think it's called an open vent? There's a tank with a ballcock in the loft that's easily opened. When I bleed the radiators black stuff comes out, that hasn't happened before. I tried turning one of the taps under the boiler, and that was black water too. So possibly full of crap now? How...

Do you mean the red circle in the image? I'm 99% sure he didnt touch them - the only thing he did turn was the red stopcock at the bottom, right, which is from the tank in the loft. The water is flowing - I can feel it and as of today it's lukewarm to the left of the LLH, but it's not flowing...

Yes it's running. It's Grundfos UPS3. The manual says to set it to speed three and let it run for a while. My system is a Grundfos Pump on the load side of the LLH, being fed from the Worcster Greenstar Boiler. Then motorised valves feeding the single pipe CH system around the house and...

Its Greenstar 8000.i THINK its supposed to auto vent. I've realised that the boiler is firing, and hot water is getting as far as my low loss header and then not going any further. The boiler then must shut off. The LLH is supposed to auto vent too.

Any tips on flushing air out of the system? Should I leave everything running, including the grundfos pumps to circulate the water round or just let things settle?

No it's really not good and really frustrating. I thought I had clearly explained the system to him. Good idea on the immersion heater. I have never used it and don't know how to, but it's also not wired in so I'd have to give that a go if I was feeling brave

We had two rads taken out to do some insulation. The plumber drained the system, took the rads of and then capped them off. He didn't refill the system, and I don't think he realised that the boiler also fed the HW tank. As of this morning, the boiler won't fire and we have no HW. Having...

Do you have just one pump? I have three. One to the right of the low loss header, flowing out of the boiler. One on the return central heating pipe, and one on the return hot water cylinder pipe. I have 20 rads in total spread across two floors, so I might need cp2 instead of one. I just...

Your post gives me some hope I can get tjjs working better. What pump have you got? Mine is a grunfos pump, and I'm not sure if I should be using the constant pressure setting, which is designed for underfloor heating, or the standard constant speed

I have poor flow through some of my radiators in a one pipe system. The actual pipe is blisteringly hot, and it's almost as hot on the return valve too. Some rads pump out heat, but most suffer from poor flow and the water isn't even getting to the lockshield return. A Plumber came out last...