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Here is the reply as promised. The thumping noises were ignition problems due to an incorrect gas/air ratio, but there were a few other problems as well which required a few new parts (nothing major). I think a piece of grit may have found its way into the pressure sensor. Here is the engineer's...

Here it is (drum roll) – what the world has been waiting for; the Vaillant engineer's report on the problem. The noise was due to an incorrect gas/air mix, but there were a few other issues as well, such as some grit in the pressure sensor.

It sounds as if your problem just might possibly be similar to mine, and although I also had new radiator valves fitted I genuinely think this has to be a coincidence. The problem seems to be caused in the vast majority of cases when the hot water tap is turned on, which is you were trying to...

Yet it happens nowhere near to the same extent with the heating as for the hot water, unless the hot water demands far more gas than the heating. Once the pipes are warmed up the heating is absolutely silent. It's obviously some kind of rare gas/air mix issue that's best left to the Vaillant...

The engineer came back thinking the problem had to be a problem in one of the drainage tubes, but water flows through and the filter on the burner is clean. He's gone to get an air blower now just to try that as well. He thinks it's a problem with the gas/air mixture but can't work out why. I...

Thank you for your continued attention. I should have referred to him as a 'plumbing and heating specialist'. He is Gas Safe registered but is a Worcester specialist, which I didn't know until he told me and phoned a local Vaillant specialist for advice. The boiler was making a rumbling noise...

I have no idea how that works or how you even recognise the pipe, but thank you. (y)

I'm very reluctant to leave the boiler banging away for a full minute in order to check that. By DHW do you mean direct hot water? I'm not sure how to check the central heating flow while I'm running the hot tap. It sounds as if it needs two people and the plumber didn't come today. I'm starting...

I have to confess to not knowing how a heat exchanger works. The only way I could visualise the water being heated up for the hot tap is that it heated up inside a small storage tank of its own. I still can't visualise how cold water can possibly be heated up so quickly without the old hot water...

Sorry dilalio - edited to say that I posted this before seeing your reply. New day, new video. This morning I was out of bed when the boiler was firing up the heating for the first time for the day, and although it was noisy it didn't make me think it was going to blow up. I tried to take some...

Thank you for the replies. I wasn't sure if anybody would still be interested in my little problem, so I would like to present it as a logic problem to solve. If I run the hot tap only slightly open, after a few seconds the water comes out hot and there are no complaints from the boiler. If I...

I was hoping it wasn't the heat exchanger, because that can apparently be a very expensive job. I wish I hadn't spent a silly amount of money on getting new radiator valves put in, especially if there was no inhibitor put in. Is that a job I could do myself without paying even more?

Not the canoe filter. :LOL: What on earth is that? :LOL: Something else I noticed is that whenever the old radiator valves used to leak, it was always clean water that leaked out. It also looked to be clear water coming out when the plumber drained the system. I didn't see him adding any Fernox...

At least that sounds like something to go on. Would that be able to affect just the hot water, and can it be cleaned rather than replaced?

I'm hoping that by adding more and information, bit by bit, something will eventually click with somebody who can make sense of these symptoms. The boiler was only three years old when I moved into my house. Right from the beginning, I had to turn my shower up to full heat in order to get it...

I'm afraid she's right and you are wrong. This is what came with my EcoFit Pure 825

Something I noticed this morning was that if I turn the hot tap on to just past a dribble, I can get hot water without the noise. It would take about five minutes to fill a bowl for doing the washing up though. I also noticed a brief whooshing noise from inside the boiler which seemed to be the...

Sorry - my mistake. It's actually an ecoFIT pure 825. I'll see if I can amend the title. If it's something to do with the ignition electrode, why is it only doing it when the hot water tap is turned on, and not when the heating first strikes up from cold? Surely it's the same principle? Editing...

It definitely has a floating valve, which has to be filled with water before being put back after cleaning. I made a video of it to send by email, but even though only a few seconds it was too large at over forty megabytes. I'll see if I can upload something to YouTube but it will take a while...

No dripping taps anywhere. He said the reason it doesn't need the insulation is because it's of a width that makes insulation unnecessary. Please don't ask me to go outside at night to measure it in this horrible weather, but I'd guess it's in the region of 5cm. In any case, if that was the...